UNITED INDUSTRIAL CORP /DE/
10-Q, 1994-11-14
MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES
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<PAGE>






                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549
                                               
                            -------------------


                                 FORM 10-Q
                                            
                               -------------





[x]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934  For the quarterly period ended September 30,
                                                          -------------
     1994    
     --------

                                     or

[_]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934  For the transition period from ___________ to
     ___________

                    Commission file number:  1-4252    
                                             ----------



                       UNITED INDUSTRIAL CORPORATION
- - ---------------------------------------------------------------------------
           (Exact Name of Registrant as Specified in its Charter)

            Delaware                                  95-2081809
- - --------------------------------           --------------------------------
 (State or Other Jurisdiction of            (I.R.S. Employer Identification
 Incorporation or Organization)                          No.)

                  18 East 48th Street, New York, NY  10017
                               (212) 752-8787
- - ---------------------------------------------------------------------------
  (Address, Including Zip Code, and Telephone Number, Including Area Code
                of Registrant's Principal Executive Offices)

                               Not Applicable
- - ---------------------------------------------------------------------------
 (Former Name, Former Address and Former Fiscal Year, if Changed Since Last
                                  Report)


Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days.    Yes  [x]   No  [_]

Indicate the number of shares outstanding of each of the issuer's classes
of common stock, as of the latest practicable date.  12,216,593 shares of
common stock as of November 1, 1994.
<PAGE>

<PAGE>



                          UNITED INDUSTRIAL CORPORATION
     




                                      INDEX
                                      -----






                                                                    Page # 
                                                                    -------
     Part I - Financial Information                              

        Item 1.  Financial Statements
          
          Consolidated Condensed Balance Sheet - Unaudited
          September 30, 1994 and December 31, 1993                        1

          Consolidated Condensed Statement of Operations -
          Three Months and Nine Months Ended 
           September 30, 1994 and 1993                                    2

          Consolidated Condensed Statement of Cash Flows
          Nine Months Ended September 30, 1994 and 1993                   3

          Notes to Consolidated Condensed Financial Statements        4 - 5


        Item 2.  Management's Discussion and Analysis of
                 Financial Condition and Results of Operation             6



     PART II - Other Information                                          7

            

<PAGE>
<PAGE>
<TABLE>
                         PART I - FINANCIAL INFORMATION
                  UNITED INDUSTRIAL CORPORATION & SUBSIDIARIES
                CONSOLIDATED CONDENSED BALANCE SHEET - UNAUDITED
                             (Dollars in Thousands)

<CAPTION>

                                                                                 September 30              December 31
                                                                                     1994                      1993
                                                                                 ------------              -----------

<S>                                                                                <C>                      <C>               
ASSETS
- - ------
Current Assets
- - --------------
        Cash & cash equivalents                                                     $  14,035                 $  3,906
        Note receivable                                                                 8,540                    8,540
        Trade receivables                                                              27,876                   45,233
        Inventories
          Finished goods & work-in-process                                             47,684                   46,087
          Materials & supplies                                                          4,234                    3,776
                                                                                     --------                 --------
                                                                                       51,918                   49,863
        Recoverable federal income taxes                                                  -                      3,618
        Deferred income taxes                                                           6,919                    8,796
        Prepaid expenses & other current assets                                         1,873                    2,480
        Assets held for sale                                                              -                      5,439
                                                                                     --------                 --------
                 Total Current Assets                                                 111,161                  127,875

Other assets                                                                           32,612                   23,096
Note receivable                                                                             -                    8,540
Deferred income taxes                                                                  10,168                   10,365

Property & equipment - less allowances
 for depreciation ($80,115 & $75,714)                                                  45,608                   46,635
                                                                                     --------                 --------
                                                                                     $199,549                 $216,511
                                                                                     ========                 ========
LIABILITIES AND SHAREHOLDERS' EQUITY 
- - -------------------------------------
Current liabilities
- - -------------------
        Notes payable to banks                                                       $  3,000                 $ 20,700
        Accounts payable                                                               10,708                    9,634
        Accrued employee compensation & taxes                                           7,720                    7,598
        Customer advances                                                               5,338                    5,725
        Other liabilities                                                               5,099                    6,370
        Provision for contract losses                                                   8,715                   10,232
        Deferred income taxes                                                           3,395                    3,493
        Estimated restructuring liability                                                 475                      750
                                                                                     --------                 --------
                 Total Current Liabilities                                             44,450                   64,502

Long-term liabilities (less current maturities)                                        30,300                   27,851
Deferred income taxes                                                                  16,540                   18,645
Accumulated postretirement benefit obligation                                          20,776                   20,159

Shareholders' Equity
- - --------------------
        Common stock $1.00 par value
        Authorized - 15,000,000 shares; outstanding
        12,230,593 shares (net of shares in treasury)                                  14,374                   14,374
        Additional capital                                                             95,451                   97,167
        Retained earnings (deficit)                                                    (4,411)                  (8,411)
        Treasury stock, at cost, 2,143,555 and 2,115,455 shares                       (17,030)                 (16,875)
        Minimum pension liability adjustment                                             (901)                    (901)
                                                                                     --------                 --------
                                                                                       87,483                   85,354
                                                                                     --------                 --------
                                                                                     $199,549                 $216,511
                                                                                     ========                 ========

</TABLE>

     See accompanying notes

<PAGE>
<PAGE>


<TABLE>
                  UNITED INDUSTRIAL CORPORATION & SUBSIDIARIES
                 CONSOLIDATED CONDENSED STATEMENT OF OPERATIONS
                 (Dollars in thousands except per share amounts)



<CAPTION>


                                                                             Three Months Ended               Nine Months Ended 
                                                                              September 30                      September 30  

                                                                           ------------------               ------------------
                                                                        1994           1993              1994          1993 
                                                                        ----          ----               ----          ----
<S>                                                                <C>            <C>                <C>           <C> 
Net Sales                                                            $ 59,710       $ 67,440          $152,002      $187,834
Operating costs & expenses

  Cost of sales                                                        46,800         57,617           115,418       154,938
  Selling & administrative                                              9,948          9,411            30,950        33,832
  Gain on sale of assets                                                  -           (1,726)              -          (1,726)
  Other expenses (income) - net                                           128           (274)             (204)         (587)
  Interest expense                                                        739            701             2,210         2,094
  Interest income                                                        (383)          (921)           (1,309)       (2,445)
  Provision for restructuring charge                                      -              -              (1,554)       23,000
                                                                     --------       --------          --------      --------
                                                                       57,232         64,808           145,511       209,106
                                                                     --------       --------          --------      --------
Income (loss) before income taxes and
 cumulative effect of accounting changes                                2,478          2,632             6,491       (21,272)
Income taxes (benefit)                                                    940            804             2,491        (7,374)
                                                                     --------       -------           --------      --------
Income (loss) before cumulative
 effect of accounting changes                                           1,538          1,828             4,000       (13,898)  


Cumulative effect as of December
 31, 1992 of changes in method of
 accounting for:
  Post retirement benefits other
    than pensions, net of taxes                                           -              -                 -         (12,890)
  Income taxes                                                            -              -                 -          13,884
                                                                     --------       --------          --------      --------
Net income (loss)                                                    $  1,538       $  1,828          $  4,000      $(12,904)
                                                                     ========       ========          ========      ========


Earnings (loss) per share:

Earnings (loss) per share before 
 cumulative effect of accounting changes                               $  .13         $  .15            $  .33        $(1.13) 
Cumulative effect of accounting 
 changes for:
  Postretirement benefits other than pensions                             -              -                 -           (1.05) 
  Income taxes                                                            -              -                 -            1.13
                                                                       ------         ------            ------        ------
  Net earnings (loss) per share                                        $  .13         $  .15            $  .33        $(1.05)

                                                                       ======        ======             ======        ======

</TABLE>

     See accompanying notes




<PAGE>
<PAGE>
<TABLE>


                  UNITED INDUSTRIAL CORPORATION & SUBSIDIARIES
                 CONSOLIDATED CONDENSED STATEMENT OF CASH FLOWS

                             (Dollars in Thousands)

<CAPTION>

                                                             NINE MONTHS ENDED SEPTEMBER 30
                                                            -------------------------------
                                                              1994                1993* 
                                                            --------            --------
      OPERATING ACTIVITIES
      --------------------
     <S>                                                    <C>             <C>                     
      Net income (loss)                                      $ 4,000         $   (12,904)
      Adjustments to reconcile net income 
       (loss) to net cash provided by 
       operating activities:
      Cumulative effect of changes in accounting for:
        Postretirement benefits                                  -                20,054
        Income taxes                                             -               (13,884)
        Depreciation and amortization                          5,318               5,608
        Deferred income taxes                                   (129)             (8,625)
        Restructuring charge                                     -                23,000
        Expenses charged to restructuring reserve                -                (6,839)
        Increase (decrease) in contract loss provision        (1,517)             12,965
        Changes in operating assets and liabilities:
        Decrease in accounts receivable                       14,329              12,670
        Increase in inventories                               (1,335)             (8,715)
        Decrease (increase) in prepaid expenses and 
         other current assets                                  6,593              (1,501)
        Decreases in accounts payable,
          accruals, advances and other                        (2,932)             (7,011)
        Increase (decrease) in federal income taxes            3,998             (10,163)
        Increase (decrease) in long-term liabilities            (283)              1,289
                                                            --------            --------
        NET CASH PROVIDED BY OPERATING ACTIVITIES             28,042               5,944


      INVESTING ACTIVITIES
      --------------------
      Decrease in note receivable                              8,540               8,540
      Purchase of property and equipment                      (3,260)             (3,310)
      Increase in other assets - net                          (3,375)             (2,799)
      Acquisition of business - net of 
       cash received                                          (2,446)                -  
                                                            --------            --------
        NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES     (541)              2,431


      FINANCING ACTIVITIES
      --------------------
      Increase in long-term liabilities                        2,199               1,608
      Proceeds from borrowings                                 9,000               9,000
      Payments on long-term debt & borrowings                (26,700)            (16,510)
      Dividends                                               (1,716)             (3,432)
      Purchase of treasury shares                               (155)                -  
                                                            --------             -------
        NET CASH USED IN FINANCING ACTIVITIES                (17,372)             (9,334)
                                                            --------             -------
        INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS      10,129                (959)
        CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD       3,906               2,608
                                                            --------            --------
        CASH AND CASH EQUIVALENTS AT END OF PERIOD         $  14,035            $  1,649

                                                           =========            ========

</TABLE>

     See accompanying notes

     * Restated to conform to current classifications

                                             
<PAGE>

<PAGE>

                 UNITED INDUSTRIAL CORPORATION AND SUBSIDIARIES


     Notes to Consolidated Condensed Financial Statements

     September 30, 1994


     NOTE A - BASIS OF PRESENTATION

     The accompanying unaudited consolidated condensed financial statements
     have been prepared in accordance with generally accepted accounting
     principles for interim financial information and with the instructions
     to Form 10-Q and Rule 10-01 of Regulation S-X.  Accordingly, they do
     not include all of the information and footnotes required by generally
     accepted accounting principles for complete financial statements.  In
     the opinion of management, all adjustments (consisting of normal
     recurring accruals) considered necessary for a fair presentation have
     been included.  Operating results for the nine month period ended
     September 30, 1994 are not necessarily indicative of the results that
     may be expected for the year ending December 31, 1994.  For further
     information, refer to the consolidated financial statements and
     footnotes thereto included in the Company's annual report on Form 10-K
     for the year ended December 31, 1993.

     NOTE B - RESTRUCTURING CHARGE 

     The Consolidated Condensed Statement of Operations for the nine months
     ended September 30, 1993 includes a restructuring charge of $23
     million ($14.7 million or $1.20 per share, net of income tax benefit). 
     The charge covered the anticipated cost of organizational and product
     line changes, consolidation of facilities, and work force reductions
     of approximately 300 at AAI and its four subsidiaries.  A major
     portion of the charge covered the curtailment of operations of
     AAI/MICROFLITE in Binghamton, New York, due to lack of significant new
     orders.  AAI/MICROFLITE was acquired in 1991.  During the nine months
     ended September 30, 1993, AAI/MICROFLITE sales amounted to $646,000,
     and losses were $1,581,000 or $.13 per share.  At September 30, 1994,
     the restructuring program was substantially completed and only
     $475,000 related to the consolidation and discontinuation of certain
     manufacturing activities, had not been expended.  At December 31, 1993
     the restructuring charge was reduced from $23 million to $22.5
     million.

     NOTE C - ASSETS HELD FOR SALE

     Assets held for sale of $5,439,000 included on the consolidated
     balance sheet at December 31, 1993, relate to the remaining assets of
     AAI/MICROFLITE, including the office/manufacturing complex.  The
     company sold these assets in 1994.  The profit of $1,304,000 is
     included in the provision for restructuring in the Consolidated
     Condensed Statement of Operations.

     NOTE D - DIVIDENDS

     A quarterly dividend of $.07 per share is payable November 30, 1994
     and additional capital has been reduced.  

     NOTE E - STOCK OPTIONS

     In May 1994, the shareholders approved the 1994 Stock Option Plan,
     which provides for the granting of 600,000 stock options to key
     employees.  Options granted may be either "incentive stock options,"
     within the meaning of Section 422A of the Internal Revenue Code, or
     non-qualified  options.










                                        
<PAGE>

<PAGE>

     The options are granted at market value at the date of grant and are
     exercisable over a period determined by the Board of Directors, but no
     longer than ten years after the date they are granted.

     On June 21, 1994 options were granted for 91,000 shares at an option
     price per share of $4.75.





































































                                        
<PAGE>

<PAGE>

     NOTE F - LEGAL PROCEEDINGS
      
     The company, along with various other parties, has been named in three
     claims (including two tort claims, one of which alleges class action)
     relating to environmental matters based on allegations partially
     related to a predecessor's operations.  These tort actions seek
     recovery for personal injury and property damage among other damages.

     The company owned and operated a small facility at a site in the State
     of Arizona that manufactured semi-conductors between 1959 and 1960. 
     All such operations of the company were sold prior to 1962.  This
     facility may have used trichloroethylene ("TCE") in small quantities. 
     However, to date, there is no evidence that this facility released or
     disposed of TCE at this site.

     On May 18, 1993, the State of Arizona filed suit against the company
     seeking the recovery of investigative costs, injunctive relief to
     require the company to perform a Remedial Investigation and
     Feasibility Study, and ultimately to require the remediation of
     alleged soil and groundwater contamination at and near a certain
     industrial site.  In response to the State's claim the company filed a
     third party complaint that seeks contribution from seventy-five
     identified possible responsible parties that are believed to have used
     solvents on and around the company's former site. 

     Management intends to vigorously contest these actions and believes
     that the resolution of these actions will not be material to the
     company.
       
     The company is involved in various other law suits and claims,
     including certain other environmental matters, arising out of the
     normal course of its business.  In the opinion of management, the
     ultimate amount of liability, if any, under pending litigation,
     including claims described above, will not have a materially adverse
     effect on the consolidated financial position of the company.   

     NOTE G - ACQUISITIONS

     On January 18, 1994, the company purchased all the outstanding shares
     of  Symtron Systems, Inc. (Symtron), a producer of fire training
     simulators for the military and commercial markets.  The purchase
     price consists of an initial payment of $1,500,000, a subsequent
     payment of $500,000, assumption of certain liabilities of
     approximately $5,900,000 and contingent payments, not to exceed
     $1,000,000, based on the net worth at specified dates and future
     profits on contracts existing at the acquisition date.  Additionally,
     contingent amounts are payable if certain pretax profits, as defined
     in the purchase agreement, are earned for each of the years in the
     five year period ending December 31, 1998.  Funds generated from
     operations and an existing line of credit were utilized to finance the
     purchase of Symtron.

     The acquisition is accounted for as a purchase, accordingly, the
     operations of Symtron are included in the company's 1994 financial
     statements.  Symtron had sales of $3,900,000 and a net loss of
     $386,000 for the nine months ending September 30, 1994. 

     NOTE H - CREDIT ARRANGEMENTS

     At September 30, 1994 AAI Corporation (a wholly owned subsidiary) had
     no short term borrowings.  On October 13, 1994 AAI entered into a two
     year revolving credit arrangement with two banks for $20 million,
     including a commitment for up to $10 million of commercial letters of
     credit.  The revolving credit is limited to a percentage of the
     eligible accounts receivable, as defined. 










                                        
<PAGE>

<PAGE>

     Immediately prior to entering into this credit facility, AAI prepaid
     $5 million of the $25 million notes with certain insurance companies,
     thereby reducing the outstanding principal balance to an aggregate of
     $20 million.  The agreement provides that AAI may select among several
     interest rate options.  The agreement provides for restrictive
     covenants among which are; the maintenance of a certain capital base,
     as defined, leverage and cash flow coverage ratios, limitations on
     indebtedness, and limitations on transfers of funds, and use of such
     funds by, the company and its wholly owned subsidiaries.  The loan and
     the outstanding notes with the insurance companies are collateralized
     by the capital stock and assets of AAI and its wholly owned
     subsidiaries and certain wholly owned subsidiaries of the company. 
     The loan and the outstanding notes with the insurance companies are
     guaranteed by the company, certain of its wholly owned subsidiaries
     and all AAI wholly owned subsidiaries.  

     The note agreements and guarantee agreements with the insurance
     companies have been amended to permit the granting of the security
     interest and liens under the credit agreement and the related
     guarantees.

     NOTE I

     In June 1994, the Board of Directors authorized the purchase of up to
     100,000 shares of the company's common stock, from time to time, in
     the open market.  Under this authorization the company purchased
     42,100 shares through October 31, 1994 at an average price of $5.47.
















































                                        
<PAGE>

<PAGE>

     
     
     MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION 

     Net sales for the first nine months of 1994 were $35,832,000 lower
     than for the prior  year and $7,730,000 lower for the three months
     period ending September 30, 1994 than the prior period.  Sales
     decreased in the defense and energy systems segments in the nine month
     period and decreased in the defense segment in the three months
     period.  The major decrease in the defense segment was due to a lack
     of new government orders caused by the Government's reduced budget. 
     Symtron (acquired in 1994) sales of $3,900,000 and $1,300,000 are
     included for the nine and three months, respectively.

     The net loss for the first nine months of 1993 includes a
     restructuring charge at the AAI Corporation subsidiary of $23 million
     ($14.7 million, or $1.20 per share net of income tax benefit).  The
     charge covered the anticipated cost of organizational and product-line
     changes, the consolidation of facilities, and work force reductions of
     approximately 300 in AAI and its four subsidiaries.  A major portion
     of the charge covered the curtailment of operations of AAI/MICROFLITE
     in Binghamton, New York due to lack of significant new orders. 
     AAI/MICROFLITE was acquired in 1991.  Predominately a defense
     contractor, AAI is in the process of realigning its business to become
     more competitive in the marketplace with its current customers and to
     enter new non-DOD markets.  Net loss included a loss of $1,581,000
     ($.13 per share), from operations of AAI/MICROFLITE, in the first nine
     months of 1993.

     In the nine month period the cost of sales as a percent of sales
     decreased from 82.4 in 1993 to 75.9 in 1994, primarily due to the
     recognition of losses of approximately $21.2 million in 1993 on
     certain long-term contracts and from 85.4 in 1993 to 78.4 in 1994 for
     the three month period. 
        
     The company sold $5,439,000 of the remaining AAI/MICROFLITE assets in
     1994.  The profit of $1,304,000 is included in the provision for
     restructuring in the Consolidated Condensed Statement of Operations. 
     Income for the three and nine month periods in 1993 includes profit of
     $1,726,000 on the sale of land and land improvements.

     Cash and cash equivalents increased by $10,129,000 from December 31,
     1993.  See Consolidated Condensed Statement of Cash Flows.  The
     restructuring charge ($23 million), the accumulated postretirement
     benefit obligation ($20 million) and the change in the deferred
     federal income taxes due to a change in accounting method ($13.9
     million) are non-cash items in 1993 and are included in the
     Consolidated Condensed Statement of Cash Flows as adjustments to
     reconcile net income to net cash provided or used in operating
     activities.  At December 31, 1993 the restructuring charge was reduced
     from $23 million to $22.5 million.

     Effective January 1, 1993 the company adopted FASB Statement No. 109
     (see Note B of the Condensed Financial Statement) decreasing net loss
     by $13.9 million or $1.13 per share.  Deferred federal income taxes -
     current was reduced $16.4 million and non-current was increased $2.5
     million.

     Effective January 1, 1993 the company adopted FASB Statement No. 106
     (see Note B of the Condensed Financial Statement) increasing net loss
     by $12.9 million or $1.05 per share.  

     At September 30, 1994 AAI Corporation (a wholly owned subsidiary) had
     no short term borrowings.  On October 13, 1994 AAI entered into a two
     year revolving credit arrangement with two banks for










                                       10
<PAGE>

<PAGE>

     $20 million, including a commitment for up to $10 million of
     commercial letters of credit.  The revolving credit is limited to a
     percentage of the eligible accounts receivable, as defined. 
     Immediately prior to entering into this credit facility, AAI prepaid
     $5 million of the $25 million notes with certain insurance companies,
     thereby reducing the outstanding principal balance to an aggregate of
     $20 million.  The agreement provides that AAI may select among several
     interest rate options.  The agreement provides for restrictive
     covenants among which are; the maintenance of a certain capital base,
     as defined, leverage and cash flow coverage ratios, limitations on
     indebtedness, and limitations on transfers of funds, and use of such
     funds by, the company and its wholly owned subsidiaries.  The loan and
     the outstanding notes with the insurance companies are collateralized
     by the capital stock and assets of AAI and its wholly owned
     subsidiaries and certain wholly owned subsidiaries of the company. 
     The loan and the outstanding notes with the insurance companies are
     guaranteed by the company, certain of its wholly owned subsidiaries
     and all AAI wholly owned subsidiaries.  

     The note agreements and guarantee agreements with the insurance
     companies have been amended to permit the granting of the security
     interest and liens under the credit agreement and the related
     guarantees.




















































                                      
<PAGE>

<PAGE>


                 UNITED INDUSTRIAL CORPORATION AND SUBSIDIARIES



     PART II - Other Information



       ITEM 6 - Exhibits and Reports on Form 8-K

       (a)   Exhibits

             10.1 - Credit Agreement dated as of October 13, 1994 among
                    AAI Corporation ("AAI"), the Lenders parties thereto
                    and First Fidelity Bank, National Association as Agent
                    (the "Agent") and Issuing Bank

             10.2 - Pledge and Security Agreement dated as of October 13,
                    1994 by AAI in favor of the Agent

             10.3 - Pledge and Security Agreement dated as of October 13,
                    1994 by the Company in favor of the Agent

             10.4 - Security Agreement dated as of October 13, 1994
                    between AAI and the Agent

             10.5 - Security Agreement dated as of October 13, 1994
                    between each subsidiary of AAI, certain subsidiaries
                    of the Company and the Agent

             10.6 - Guaranty dated as of October 13, 1994 by the Company
                    and certain of its subsidiaries and by each subsidiary
                    of AAI in favor of the Agent

             10.7 - Amendment No. 3 to Note Purchase Agreement dated as of
                    October 13, 1994 among AAI, Principal Mutual Life
                    Insurance Company and The Travelers Insurance Company
                    (collectively, the "Purchasers")

             10.8 - Amendment No. 2 to Guaranty Agreement dated as of
                    October 13, ,1994 among the Company and the Purchasers

             11   - Computation of Earnings per share

             27   - Financial Data Schedule

          (b)  The Registrant did not file any reports on Form 8-K during
               the quarter ended September 30, 1994.
            

























                                      
<PAGE>

<PAGE>






                                    SIGNATURE
                                    ---------


     Pursuant to the requirements of the Securities Exchange Act of 1934,
     the registrant has duly caused this report to be signed on its behalf
     by the undersigned, thereunto duly authorized.



                                      UNITED INDUSTRIAL CORPORATION



     Date November 14, 1994        By: /s/ Howard M. Bloch     
          -----------------           ------------------------------
                                      Howard M. Bloch, Treasurer and
                                      Chief Financial Officer




















































                                      
<PAGE>

<PAGE>



                 UNITED INDUSTRIAL CORPORATION AND SUBSIDIARIES


                        INDEX OF EXHIBITS FILED HEREWITH







     Exhibit No.                                                       Page
     -----------                                                       ----

       10.1 -  Credit Agreement dated as of October 13, 1994
               among AAI Corporation ("AAI"), the Lenders parties
               thereto and First Fidelity Bank, National
               Association as Agent (the "Agent") and Issuing
               Bank

       10.2 -  Pledge and Security Agreement dated as of October
               13, 1994 by AAI in favor of the Agent

       10.3 -  Pledge and Security Agreement dated as of October
               13, 1994 by the Company in favor of the Agent

       10.4 -  Security Agreement dated as of October 13, 1994
               between AAI and the Agent

       10.5 -  Security Agreement dated as of October 13, 1994
               between each subsidiary of AAI, certain
               subsidiaries of the Company and the Agent

       10.6 -  Guaranty dated as of October 13, 1994 by the
               Company and certain of its subsidiaries and by
               each subsidiary of AAI in favor of the Agent

       10.7 -  Amendment No. 3 to Note Purchase Agreement dated
               as of October 13, 1994 among AAI, Principal Mutual
               Life Insurance Company and The Travelers Insurance
               Company (collectively, the "Purchasers")

       10.8 -  Amendment No. 2 to Guaranty Agreement dated as of
               October 13, ,1994 among the Company and the
               Purchasers

       11   -  Computation of Earnings per share

       27   -  Financial Data Schedule



<PAGE>
     



                                                                           
     ======================================================================

                                CREDIT AGREEMENT



                                      among



                                AAI CORPORATION,



                           THE LENDERS PARTIES HERETO,



                   FIRST FIDELITY BANK, NATIONAL ASSOCIATION,

                                as Issuing Bank,



                                       and



                   FIRST FIDELITY BANK, NATIONAL ASSOCIATION,

                                    as Agent


                                                                           
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                                TABLE OF CONTENTS
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     SECTION 1.  CONSTRUCTION AND DEFINITIONS  . . . . . . . . . . . .    1

          1.1    Defined Terms . . . . . . . . . . . . . . . . . . . .    1
          1.2    Other Definitional Provisions . . . . . . . . . . . .   28

     SECTION 2.  AMOUNT AND TERMS OF LOAN COMMITMENTS  . . . . . . . .   29

          2.1    Revolving Credit Commitments  . . . . . . . . . . . .   29
          2.2    Revolving Credit Notes  . . . . . . . . . . . . . . .   30
          2.3    Procedure for Revolving Credit Borrowing  . . . . . .   30
          2.4    Fees and Reduction of Commitments . . . . . . . . . .   32
          2.5    Payment at Maturity . . . . . . . . . . . . . . . . .   32
          2.6    Optional Prepayments  . . . . . . . . . . . . . . . .   32
          2.7    Mandatory Prepayments . . . . . . . . . . . . . . . .   33
          2.8    Conversion Options; Minimum Amount of Loans . . . . .   33
          2.9    Minimum Amounts of Tranches . . . . . . . . . . . . .   33
          2.10   Interest Rate and Payment Dates . . . . . . . . . . .   34
          2.11   Computation of Interest and Fees  . . . . . . . . . .   34
          2.12   Inability to Determine Interest Rate  . . . . . . . .   35
          2.13   Pro Rata Treatment and Payments . . . . . . . . . . .   35
          2.14   Illegality  . . . . . . . . . . . . . . . . . . . . .   37
          2.15   Requirements of Law . . . . . . . . . . . . . . . . .   38
          2.16   Taxes . . . . . . . . . . . . . . . . . . . . . . . .   39
          2.17   Indemnity . . . . . . . . . . . . . . . . . . . . . .   41
          2.18   Certain Calculations  . . . . . . . . . . . . . . . .   41

     SECTION 3.  LETTERS OF CREDIT . . . . . . . . . . . . . . . . . .   41

          3.1    Letter of Credit Commitment . . . . . . . . . . . . .   41
          3.2    L/C Participations  . . . . . . . . . . . . . . . . .   42
          3.3    Repayment of Participants . . . . . . . . . . . . . .   43
          3.4    Role of the Issuing Bank  . . . . . . . . . . . . . .   43
          3.5    Lenders' Obligations Absolute . . . . . . . . . . . .   44


































     
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          3.6    Reinstatement and Survival  . . . . . . . . . . . . .   44
          3.7    Procedure for Issuance and Renewal of Letters of
                 Credit  . . . . . . . . . . . . . . . . . . . . . . .   45
          3.8    Reimbursement of the Issuing Bank . . . . . . . . . .   46
          3.9    Commissions, Fees and Charges . . . . . . . . . . . .   47
          3.10   Interest on Amounts Disbursed under Letters of
                 Credit  . . . . . . . . . . . . . . . . . . . . . . .   48
          3.11   Computation of Interest and Fees; Payment not on
                 Business Days . . . . . . . . . . . . . . . . . . . .   48
          3.12   Increased Costs . . . . . . . . . . . . . . . . . . .   48
          3.13   Nature of Obligations; Indemnities  . . . . . . . . .   49
          3.14   Resignation of Issuing Bank . . . . . . . . . . . . .   51

     SECTION 4.  REPRESENTATIONS AND WARRANTIES  . . . . . . . . . . .   52

          4.1    Financial Condition . . . . . . . . . . . . . . . . .   52
          4.2    Borrowing Base  . . . . . . . . . . . . . . . . . . .   53
          4.3    No Change . . . . . . . . . . . . . . . . . . . . . .   53
          4.4    Organization and Good Standing; Compliance with Law .   53
          4.5    Authorization; Enforceable Obligations  . . . . . . .   53
          4.6    No Legal Bar  . . . . . . . . . . . . . . . . . . . .   54
          4.7    No Material Litigation; Labor Matters . . . . . . . .   54
          4.8    No Default  . . . . . . . . . . . . . . . . . . . . .   54
          4.9    Ownership of Property; Liens  . . . . . . . . . . . .   54
          4.10   Business Premises . . . . . . . . . . . . . . . . . .   55
          4.11   Subsidiaries  . . . . . . . . . . . . . . . . . . . .   55
          4.12   Ownership of Entities . . . . . . . . . . . . . . . .   55
          4.13   Environmental . . . . . . . . . . . . . . . . . . . .   55
          4.14   Intellectual Property . . . . . . . . . . . . . . . .   56
          4.15   Solvency  . . . . . . . . . . . . . . . . . . . . . .   57
          4.16   No Burdensome Restrictions  . . . . . . . . . . . . .   57
          4.17   Taxes . . . . . . . . . . . . . . . . . . . . . . . .   57
          4.18   Federal Regulations . . . . . . . . . . . . . . . . .   57
          4.19   ERISA . . . . . . . . . . . . . . . . . . . . . . . .   58
          4.20   Investment Company Act; Other Regulations . . . . . .   58
          4.21   Accuracy and Completeness of Information  . . . . . .   58
          4.22   Certain Indebtedness  . . . . . . . . . . . . . . . .   59
          4.23   Primary Banking Relationship  . . . . . . . . . . . .   59
          4.24   Purpose of Loans  . . . . . . . . . . . . . . . . . .   59





























     
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     SECTION 5.  CONDITIONS PRECEDENT  . . . . . . . . . . . . . . . .   60

          5.1    Conditions to Initial Extensions of Credit  . . . . .   60
                 (a)   Credit Documents  . . . . . . . . . . . . . . .   60
                 (b)   Private Placement Debt Documents; Certificates;
                       Conditions  . . . . . . . . . . . . . . . . . .   60
                 (c)   Intercreditor Agreement . . . . . . . . . . . .   61
                 (d)   Consents  . . . . . . . . . . . . . . . . . . .   61
                 (e)   Related Agreements  . . . . . . . . . . . . . .   61
                 (f)   Title Insurance . . . . . . . . . . . . . . . .   61
                 (g)   Environmental Assessment  . . . . . . . . . . .   61
                 (h)   Appraisals  . . . . . . . . . . . . . . . . . .   61
                 (i)   Borrowing Certificate . . . . . . . . . . . . .   62
                 (j)   Borrowing Base Certificate  . . . . . . . . . .   62
                 (k)   Borrower Proceedings  . . . . . . . . . . . . .   62
                 (l)   Guarantor Proceedings . . . . . . . . . . . . .   62
                 (m)   Borrower and Guarantor Incumbency Certificate .   62
                 (n)   Borrower and Guarantor Organizational
                       Documents . . . . . . . . . . . . . . . . . . .   63
                 (o)   Good Standing Certificates  . . . . . . . . . .   63
                 (p)   Financial Information . . . . . . . . . . . . .   63
                 (q)   Litigation  . . . . . . . . . . . . . . . . . .   63
                 (r)   No Violation  . . . . . . . . . . . . . . . . .   63
                 (s)   Consents, Licenses, Approval, Etc.  . . . . . .   63
                 (t)   Delivery of Stock Certificates  . . . . . . . .   64
                 (u)   Fees  . . . . . . . . . . . . . . . . . . . . .   64
                 (v)   Filings, Registrations and Recordings . . . . .   64
                 (w)   Lien Searches . . . . . . . . . . . . . . . . .   64
                 (x)   Insurance . . . . . . . . . . . . . . . . . . .   64
                 (y)   Legal Opinions  . . . . . . . . . . . . . . . .   64
                 (z)   Accounts Dilution . . . . . . . . . . . . . . .   65
                 (aa)  Landlord Agreements . . . . . . . . . . . . . .   65
                 (bb)  Title Insurance Company Charges . . . . . . . .   65
          5.2    Conditions to Each Loan and Each Letter of Credit . .   65
                 (a)   Representations and Warranties  . . . . . . . .   65
                 (b)   No Default  . . . . . . . . . . . . . . . . . .   66
                 (c)   No Material Litigation  . . . . . . . . . . . .   66
                 (d)   No Material Adverse Change  . . . . . . . . . .   66
                 (e)   Additional Documents  . . . . . . . . . . . . .   66
                 (f)   Additional Matters  . . . . . . . . . . . . . .   66




























     
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     SECTION 6.  AFFIRMATIVE COVENANTS . . . . . . . . . . . . . . . .   66

          6.1    Financial Information . . . . . . . . . . . . . . . .   66
          6.2    Payment of Obligations  . . . . . . . . . . . . . . .   69
          6.3    Conduct of Business and Maintenance of Existence  . .   70
          6.4    Maintenance of Property; Insurance  . . . . . . . . .   70
          6.5    Inspection of Property; Books and Records;
                 Discussions . . . . . . . . . . . . . . . . . . . . .   70
          6.6    Notices . . . . . . . . . . . . . . . . . . . . . . .   71
          6.7    Government Regulations  . . . . . . . . . . . . . . .   72
          6.8    Environmental . . . . . . . . . . . . . . . . . . . .   72
          6.9    Subsidiary Documents  . . . . . . . . . . . . . . . .   74
          6.10   Facility Fee  . . . . . . . . . . . . . . . . . . . .   74
          6.11   Real Property Surveys . . . . . . . . . . . . . . . .   74
          6.12   Transit Investment  . . . . . . . . . . . . . . . . .   75

     SECTION 7.  NEGATIVE COVENANTS  . . . . . . . . . . . . . . . . .   75

          7.1    Financial Condition Covenants . . . . . . . . . . . .   75
                 (a)   Maintenance of Capital Base . . . . . . . . . .   75
                 (b)   Leverage Ratio  . . . . . . . . . . . . . . . .   76
                 (c)   Cash Flow Coverage Ratio  . . . . . . . . . . .   76
                 (d)   Capital Expenditures  . . . . . . . . . . . . .   76
          7.2    Limitation on Indebtedness  . . . . . . . . . . . . .   76
          7.3    Limitation on Liens . . . . . . . . . . . . . . . . .   78
          7.4    Limitation on Contingent Obligations  . . . . . . . .   80
          7.5    Limitations on Fundamental Changes  . . . . . . . . .   80
          7.6    Limitation on Acquisitions  . . . . . . . . . . . . .   81
          7.7    Limitation on Sale of Assets  . . . . . . . . . . . .   81
          7.8    Limitation on Restricted Payments . . . . . . . . . .   82
          7.9    Limitation on Transactions with Affiliates  . . . . .   83
          7.10   Limitation on Subsidiaries  . . . . . . . . . . . . .   84
          7.11   Limitation on Investments, Loans and Advances . . . .   84
          7.12   Limitation on Optional Payments and Modifications . .   85
          7.13   Limitation on Sale and Leaseback  . . . . . . . . . .   85
          7.14   Fiscal Year . . . . . . . . . . . . . . . . . . . . .   85
          7.15   Places of Business  . . . . . . . . . . . . . . . . .   85
          7.16   Change of Name  . . . . . . . . . . . . . . . . . . .   86
          7.17   Compliance with ERISA . . . . . . . . . . . . . . . .   86
          7.18   Environmental . . . . . . . . . . . . . . . . . . . .   86




























     
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          7.19   Limitation on Negative Pledge Clauses . . . . . . . .   87
          7.20   Limitation on Inconsistent Agreements . . . . . . . .   87

     SECTION 8.  EVENTS OF DEFAULT . . . . . . . . . . . . . . . . . .   87

          8.1    Events of Default . . . . . . . . . . . . . . . . . .   87
          8.2    Confession of Judgment  . . . . . . . . . . . . . . .   93

     SECTION 9.  THE AGENT . . . . . . . . . . . . . . . . . . . . . .   94

          9.1    Appointment . . . . . . . . . . . . . . . . . . . . .   94
          9.2    Delegation of Duties  . . . . . . . . . . . . . . . .   94
          9.3    Exculpatory Provisions  . . . . . . . . . . . . . . .   94
          9.4    Reliance by Agent . . . . . . . . . . . . . . . . . .   95
          9.5    Notice of Default . . . . . . . . . . . . . . . . . .   95
          9.6    Non-Reliance on Agent and Other Lenders . . . . . . .   96
          9.7    Indemnification . . . . . . . . . . . . . . . . . . .   96
          9.8    Agent in Its Individual Capacity  . . . . . . . . . .   97
          9.9    Successor Agent . . . . . . . . . . . . . . . . . . .   97
          9.10   Authority to Execute Intercreditor Agreement  . . . .   97

     SECTION 10. MISCELLANEOUS . . . . . . . . . . . . . . . . . . . .   97

          10.1   Amendments and Waivers  . . . . . . . . . . . . . . .   97
          10.2   More Restrictive Provisions . . . . . . . . . . . . .   99
          10.3   Notices . . . . . . . . . . . . . . . . . . . . . . .   99
          10.4   No Waiver; Cumulative Remedies  . . . . . . . . . . .  100
          10.5   Survival of Representations and Warranties  . . . . .  100
          10.6   Payment of Expenses and Taxes . . . . . . . . . . . .  100
          10.7   Further Assurances  . . . . . . . . . . . . . . . . .  101
          10.8   Unenforceability  . . . . . . . . . . . . . . . . . .  102
          10.9   Indemnification Concerning Fees . . . . . . . . . . .  102
          10.10  Waiver of Trial by Jury . . . . . . . . . . . . . . .  102
          10.11  Additional Waivers  . . . . . . . . . . . . . . . . .  103
          10.12  Successors and Assigns; Participations; Purchasing
                 Lenders . . . . . . . . . . . . . . . . . . . . . . .  103
          10.13  Adjustments; Periodic Charging of Accounts; Setoff  .  106
          10.14  Additional Lenders and Additional Credit  . . . . . .  107
          10.15  Counterparts  . . . . . . . . . . . . . . . . . . . .  107
          10.16  GOVERNING LAW . . . . . . . . . . . . . . . . . . . .  107




























     
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          10.17  Submission To Jurisdiction    . . . . . . . . . . . .  108
          10.18  Payments in Foreign Currency  . . . . . . . . . . . .  108
          10.19  Acknowledgment Concerning Intercreditor Agreement . .  109



     Schedule      I    Borrower Business Premises
     Schedule     II    Lending Offices and Commitments
     Schedule    III    Industry Lane Real Property Proposed To Be Sold
     Schedule     IV    Real Property Collateral
     Schedule      V    York Road Real Property Proposed To Be Sold
     Schedule    4.7    Litigation Matters
     Schedule    4.8    Contractual Obligations
     Schedule   4.13    Environmental Matters
     Schedule   4.14    Intellectual Property Domestically Registered
     Schedule   4.19    ERISA Matters
     Schedule    7.3    Permitted Liens



















































     
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     Exhibit A       Form of Commercial Letter of Credit Application
     Exhibit B       Form of Standby Letter of Credit Application
     Exhibit C       Form of Officer Default Certificate
     Exhibit D       Form of Officer Financial Covenant Certificate
     Exhibit E       Form of Officer Reliance Certificate
     Exhibit F       Form of Revolving Credit Note
     Exhibit G       Form of Borrowing Certificate
     Exhibit H       Form of Commitment Transfer Supplement


































































     



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                                CREDIT AGREEMENT


               THIS CREDIT AGREEMENT is made as of the 13th day of October,
     1994, by and among AAI CORPORATION, a Maryland corporation (the
     "Borrower"), the Lenders parties to this Agreement (collectively, the
     "Lenders"), FIRST FIDELITY BANK, NATIONAL ASSOCIATION, as Agent (in
     such capacity as further defined hereinafter, the "Agent"), and FIRST
     FIDELITY BANK, NATIONAL ASSOCIATION, as Issuing Bank (in such capacity
     as further defined hereinafter, the "Issuing Bank").

               The parties hereto hereby agree as follows:

               SECTION 1.  CONSTRUCTION AND DEFINITIONS

               1.1  Defined Terms.  As used in this Agreement, the
                    -------------
     following terms have the following meanings:

               "ACCOUNTANT DEFAULT CERTIFICATE":  a certificate, in form
     and content satisfactory to the Required Lenders, of the independent
     certified public accountants who examined and audited annual financial
     statements of the Borrower and its Subsidiaries certifying to the
     Lenders whether, in the course of such examination and audit, any
     information came to their attention causing them to know or believe
     that any Default or Event of Default existed and, if so, setting forth
     the facts relevant thereto.

               "ACCOUNTS CREDIT PERCENTAGE":  eighty percent (80%) in the
     case of Eligible Accounts which did not arise from progress billings,
     and sixty-five percent (65%) in the case of Eligible Accounts which
     arose from progress billings, or in either case, such lesser
     percentage or percentages as shall from time to time be established by
     the Required Lenders, in the discretion of the Required Lenders
     exercised in good faith, and communicated to the Borrower in writing
     by the Agent, with respect to Eligible Accounts, specific Eligible
     Accounts or categories, types or components of Eligible Accounts. 
     Such lesser percentage or percentages may be based upon evaluations of
     risk by the Lenders or any other factors deemed relevant by the
     Lenders, whether or not such factors have theretofore been used,
     contemplated or foreseen as a basis for adjusting the Accounts Credit
     Percentage.

               "AFFILIATE":  as to any Person:  (a) any Person in which
     such Person legally or beneficially owns or holds, directly or
     indirectly, five percent (5%) or more of the capital stock,
     partnership interests or other equity interests; (b) any partnership
     in which such Person is a general partner or any joint venture in
     which such Person is a joint venturer; (c) any























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     Person that is a director, officer or employee of any of the foregoing
     or of such Person or that legally or beneficially owns or holds,
     directly or indirectly, five percent (5%) or more of the capital
     stock, partnership interests or other equity interests in any of the
     foregoing or in such Person; and (d) any Person that directly or
     indirectly has the right or power to direct the management or policies
     of any of the foregoing or of such Person and any Person whose
     management or policies any of the foregoing or such Person directly or
     indirectly has the right or power to direct.

               "AGGREGATE BORROWING BASE CHARGE":  at a particular time,
     the sum of (a) the Aggregate Loans Outstanding of all Lenders as at
     such time and (b) the L/C Exposure as at such time.

               "AGGREGATE LOANS OUTSTANDING":  as to any Lender at a
     particular time, the aggregate principal amount of the Revolving
     Credit Loans of such Lender outstanding as at such time.

               "AGREEMENT":  this Credit Agreement, as amended, modified,
     extended, renewed, supplemented or replaced from time to time.

               "APPLICABLE MARGIN":  

                    (a)  With respect to Base Rate Loans:  (i) one-half of
     one percent (.50%) at all times that the Private Placement Debt
     Balance is greater than Twelve Million Five Hundred Thousand Dollars
     ($12,500,000.00); (ii) one-quarter of one percent (.25%) at all times
     that the Private Placement Debt Balance is greater than zero but less
     than or equal to Twelve Million Five Hundred Thousand Dollars
     ($12,500,000.00); and (iii) zero at all times that the Private
     Placement Debt Balance is zero; and

                    (b)  With respect to Eurodollar Loans:  (i) two percent
     (2%) at all times that the Private Placement Debt Balance is greater
     than Twelve Million Five Hundred Thousand Dollars ($12,500,000.00);
     (ii) one and three-quarters percent (1.75%) at all times that the
     Private Placement Debt Balance is greater than zero but less than or
     equal to Twelve Million Five Hundred Thousand Dollars
     ($12,500,000.00); and (iii) one and one-half percent (1.5%) at all
     times that the Private Placement Debt Balance is zero. 

               "AUTHORIZED OFFICER":  in the case of any Person, the
     President, Vice President or Treasurer of such Person whose name
     appears on a certificate of incumbency of such Person delivered
     concurrently with the execution of this Agreement, as such certificate
     of incumbency may be amended from time to time.




























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               "AVAILABLE COMMITMENT":  as to any Lender at a particular
     time, the amount, if any, by which (a) the amount of such Lender's
     Revolving Credit Commitment as at such time, exceeds (b) the Total
     Usage with respect to such Lender as at such time.

               "BASE RATE":  the rate of interest established by First
     Fidelity as its reference rate in making loans, which does not reflect
     the rate of interest charged to any particular borrower or class of
     borrowers.  The Borrower acknowledges that the Base Rate is not tied
     to any external rate of interest or index.  Any rate of interest under
     this Agreement or any of the other Credit Documents which is based
     upon the Base Rate shall, automatically and effective as of the
     opening of business on the day on which any change in the Base Rate is
     announced, change in an amount equal to any such increase or decrease
     in the Base Rate, without notice to the Borrower.

               "BASE RATE LOANS":  Revolving Credit Loans at such time as
     they are made and/or being maintained at a rate of interest based upon
     the Base Rate.

               "BORROWER BUSINESS PREMISES":  the collective reference to
     the Borrower Chief Executive Office and the other premises of the
     Borrower identified in Schedule I.

               "BORROWER CHIEF EXECUTIVE OFFICE":  the real property and
     improvements located in Baltimore County, Maryland, owned by the
     Borrower and known as York Road and Industry Lane, Hunt Valley,
     Maryland 21030.

               "BORROWER PLEDGE AGREEMENT":  as amended, modified,
     extended, renewed, supplemented or replaced from time to time, the
     Pledge and Security Agreement to be executed and delivered by the
     Borrower in favor of the Agent, for the ratable benefit of the
     Lenders, the Issuing Bank and the Private Placement Debt Holders,
     pursuant to which the Borrower shall, among other things, grant to the
     Agent a security interest in the Borrower Subsidiary Pledged Stock.

               "BORROWER SECURITY AGREEMENT":  as amended, modified,
     extended, renewed, supplemented or replaced from time to time, the
     Security Agreement to be executed and delivered by the Borrower in
     favor of the Agent, for the ratable benefit of the Lenders, the
     Issuing Bank and the Private Placement Debt Holders, pursuant to which
     the Borrower shall, among other things, grant to the Agent a security
     interest in all present and future accounts, chattel paper,
     instruments, documents of title, general intangibles, equipment,
     inventory and other assets of the Borrower.




























     
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               "BORROWER SUBSIDIARY PLEDGED STOCK":  all capital stock
     owned by the Borrower as of the Closing Date in each Subsidiary of the
     Borrower other than Transit.

               "BORROWING BASE":  at a particular time, the product of
     (a) Eligible Accounts as at such time, and (b) the Accounts Credit
     Percentage.

               "BORROWING BASE CERTIFICATE":  a Certified report or
     schedule in form and content satisfactory to the Required Lenders
     containing such information as the Required Lenders may require from
     time to time concerning the Borrowing Base, collections or other
     proceeds of accounts of the Borrower or Eligible Affiliates and/or any
     other matter or matters as the Required Lenders may require from time
     to time, including, without limitation, information concerning cost
     accounting by the Borrower and Eligible Affiliates with respect to
     accounts or contracts of the Borrower or Eligible Affiliates and
     information concerning the cost to complete contracts of the Borrower
     or Eligible Affiliates.

               "BORROWING DATE":  any Business Day or Working Day specified
     in a notice pursuant to Subsection 2.3 as a date on which the Borrower
     requests the Lenders to make Revolving Credit Loans hereunder.

               "BUSINESS DAY":  a day other than a Saturday, Sunday or
     other day on which commercial banks in Philadelphia, Pennsylvania, are
     authorized or required by law to close.

               "CAPITAL BASE":  at a particular date, the sum of
     (a) Tangible Net Worth as at such date and (b) the UIC-DEL Standby
     Subordinated Debt Balance as at such date.

               "CAPITAL EXPENDITURES":  for a particular period, the
     aggregate amount of expenditures made or accrued by the Borrower, its
     Subsidiaries (other than Transit) and Symtron during such period
     (including expenditures made with respect to Financing Leases) which,
     in conformity with GAAP, are required to be included in a property,
     plant, equipment or comparable fixed asset account reflected in a
     consolidated balance sheet of the Borrower and its Subsidiaries (other
     than Transit) and Symtron, but excluding expenditures made in
     connection with the replacement or restoration of assets to the extent
     reimbursed or financed from insurance proceeds paid on account of loss
     of or damage to the assets being replaced or restored or from awards
     of compensation arising from the taking by condemnation or eminent
     domain of the assets being replaced or restored.

               "CARSHELL":  AAI California Carshell, Inc., a Maryland
     corporation.


























     
<PAGE>

<PAGE>
     

               "CASH COLLATERAL ACCOUNT":  a deposit account established at
     First Fidelity or at one or more banking institution or institutions
     acceptable to the Agent, each of which deposit accounts shall be under
     the exclusive control of and subject to the sole order of the Agent
     pursuant to such agreements and executed by such Persons as shall be
     satisfactory to the Agent.

               "CASH EQUIVALENTS":  (a) securities issued or directly and
     fully guaranteed or insured by the United States of America, or any
     agency or instrumentality thereof, having maturities of not more than
     six (6) months from the date of acquisition; (b) time deposits with
     First Fidelity, certificates of deposit issued by First Fidelity, and
     time deposits with, and certificates of deposit issued by, any
     commercial bank incorporated under the laws of the United States of
     America or any state thereof which has a combined capital, surplus and
     undivided profits at least equal to Five Hundred Million Dollars
     ($500,000,000.00), and having maturities of not more than six (6)
     months from the date of acquisition; (c) repurchase obligations with a
     term of not more than seven (7) days for underlying securities of the
     types described in clauses (a) and (b) above entered into with First
     Fidelity or with any commercial bank incorporated under the laws of
     the United States of America or any state thereof which has a combined
     capital, surplus and undivided profits at least equal to Five Hundred
     Million Dollars ($500,000,000.00); and (d) commercial paper of First
     Fidelity or the holding company controlling First Fidelity and
     commercial paper rated at least A-1 or the equivalent thereof by
     Standard & Poor's Corporation or P-1 or the equivalent thereof by
     Moody's Investors Service, Inc., and, in either case, maturing within
     six (6) months after the date of acquisition.

               "CASH FLOW COVERAGE RATIO":  for any period, the ratio of
     (a) EBITDA for such period, to (b) the sum of (i) the aggregate amount
     of Long-Term Debt which will be due and payable within twelve (12)
     months after the end of such period, (ii) Interest Expense for such
     period and (iii) the aggregate amount of payments which will be due
     and payable within twelve (12) months after the end of such period on
     account of all leases of any property (real, personal or mixed) by the
     Borrower, any of its Subsidiaries (other than Transit) or Symtron as
     lessee, other than Financing Leases.

               "CERTIFIED":  in the case of any statement, schedule, report
     or other document of any Person, containing a representation by an
     Authorized Officer of such Person that, to such Authorized Officer's
     knowledge and belief after diligent inquiry, such statement, schedule,
     report or other document, and the information contained therein, is
     true and complete in all material respects.




























     
<PAGE>

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               "CHANGE OF CONTROL":  (a) any Person, or two or more Persons
     acting in concert, shall directly or indirectly acquire, after the
     date of this Agreement, beneficial ownership (within the meaning of
     Rule 13d-3 of the Securities and Exchange Commission under the
     Securities Exchange Act of 1934) of twenty percent (20%) or more of
     the issued and outstanding voting capital stock of the Borrower on a
     fully-diluted basis; or (b) individuals who, as of the date of this
     Agreement, constitute the Board of Directors of the Borrower (together
     with any new director whose election by or whose nomination for
     election was approved by a vote of at least two-thirds (2/3) of the
     directors then still in office who either were directors as of such
     time or whose election or nomination for election was previously so
     approved), shall for any reason cease to constitute a majority of the
     Board of Directors of the Borrower.

               "CLOSING DATE":  the date on which the Lenders make their
     initial Revolving Credit Loans.

               "CODE":  the Internal Revenue Code of 1986, as amended from
     time to time.

               "COLLATERAL":  all property, interests and rights, and the
     products and proceeds thereof, now or hereafter directly or indirectly
     securing any of the Obligations or any Indebtedness or obligation of
     any Other Obligor with respect to any of the Obligations.

               "COMMERCIAL L/C EXPOSURE":  at a particular time, the sum,
     as at such time, of (a) that portion of the L/C Aggregate Undrawn
     Amount which is attributable to commercial Letters of Credit, and
     (b) that portion of the L/C Reimbursement Obligations which is
     attributable to commercial Letters of Credit.

               "COMMERCIAL L/C MAXIMUM EXPOSURE":  Ten Million Dollars
     ($10,000,000.00).

               "COMMERCIAL L/C NEGOTIATION FEE RATE":  three-eighths of one
     percent (3/8%).

               "COMMITMENT PERCENTAGE":  as to any Lender, the "Commitment
     Percentage" indicated for such Lender in Schedule II.

               "COMMITMENT PERIOD":  the period from and including the date
     of this Agreement to but not including the Termination Date or such
     earlier date as the Commitments shall terminate as provided herein.






























     
<PAGE>

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               "COMMITMENTS":  the collective reference to the Revolving
     Credit Commitments and the L/C Commitment.

               "COMMONLY CONTROLLED ENTITY":  an entity, whether or not
     incorporated, which is under common control with the Borrower or any
     Other Obligor within the meaning of Section 4001 of ERISA.

               "COMPENSABLE PREPAYMENT":  any payment of all or any portion
     of any of the Revolving Credit Loans prior to the date which is
     fifteen (15) months after the date of this Agreement with funds
     derived from any source other than the revenues of the business
     operations of the Borrower, any of its Subsidiaries or any Guarantor,
     whether made by the Borrower or any other Person, including, without
     limitation, any such payment made with funds borrowed from any source
     or with funds derived from the issuance or offering of Indebtedness or
     securities of the Borrower or any other Person, but not including any
     such payment (a) made after acceleration of the Revolving Credit
     Loans, (b) made with proceeds of, or as a result of (i) any damage or
     casualty to, or loss with respect to, or any sale, assignment, lease,
     rental, exchange, liquidation, condemnation, taking or other
     disposition of, any of the Collateral, or (ii) application of any
     proceeds of any of the foregoing or of any insurance, (c) made with
     proceeds of, or as a result of, sales of assets permitted under
     Subsection 7.7, or (d) made with proceeds of, or as a result of,
     payments of principal or interest made on account of the Indebtedness
     evidenced by the Excluded UIC-DEL Note (as defined in the Guarantor
     Security Agreement).

               "CONTINGENT OBLIGATION":  as to any Person, any obligation
     of such Person guaranteeing or in effect guaranteeing any
     Indebtedness, leases, dividends, letters of credit or other
     obligations (the "primary obligations") of any other Person (the
     "primary obligor") in any manner, whether directly or indirectly,
     including, without limitation, any obligation of such Person, whether
     or not contingent (a) to purchase any such primary obligation or any
     property constituting direct or indirect security therefor, (b) to
     advance or supply funds (i) for the purchase or payment of any such
     primary obligation or (ii) to maintain working capital or equity
     capital of the primary obligor or otherwise to maintain the net worth
     or solvency of the primary obligor, (c) to purchase property,
     securities or services primarily for the purpose of assuring the owner
     of any such primary obligation of the ability of the primary obligor
     to make payment of such primary obligation or (d) otherwise to assure
     or hold harmless the owner of any such primary obligation against loss
     in respect thereof.

               "CONTRACTUAL OBLIGATION":  as to any Person, any provision
     of any security issued by such Person or of any agreement, instrument
     or undertaking to which such Person is a party or by which it or any
     of its property is bound.
























     
<PAGE>

<PAGE>
     

               "CREDIT DOCUMENTS":  the collective reference to this
     Agreement, the Notes, the Borrower Security Agreement, the Borrower
     Pledge Agreement, the Deed of Trust, the Intellectual Property
     Assignments, the Guaranty, the Guarantor Security Agreement, the UIC
     Pledge Agreement, the UIC Subordination Agreement, the UIC-DEL
     Subordination Agreement, the L/C Agreements and each other agreement,
     contract, promissory note or other instrument, security agreement,
     assignment, pledge agreement, indemnification agreement, subordination
     agreement, mortgage, deed of trust, guaranty and other document now or
     hereafter evidencing, guaranteeing, securing (directly or indirectly),
     subordinating other obligations of the Borrower or any Other Obligor
     to, or containing any warranties, covenants, agreements or
     representations of any Person relating to, any Indebtedness or
     liability of the Borrower or any Other Obligor arising under this
     Agreement, the Notes, the L/C Agreements or the Guaranty, as each of
     the documents referred to in this definition may be amended, modified,
     extended, renewed, supplemented or replaced from time to time.

               "DEED OF TRUST":  as amended, modified, extended, renewed,
     supplemented or replaced from time to time, a Deed of Trust and
     Security Agreement to be executed and delivered by the Borrower to
     trustees for the benefit of the Agent encumbering the Real Property
     Collateral for the ratable benefit of the Lenders, the Issuing Bank
     and the Private Placement Debt Holders.

               "DEFAULT": the occurrence of any event which, with the
     giving of notice or the lapse of time, or both, would constitute an
     Event of Default.

               "DOLLARS" and "$":  dollars in lawful currency of the United
     States of America.

               "DOMESTIC LENDING OFFICE":  initially, the office of each
     Lender designated as such in Schedule II; thereafter, such other
     office of such Lender, if any, located within the United States of
     America, which shall be making or maintaining Base Rate Loans.

               "EBIT":  for any period, the consolidated net income of the
     Borrower, its Subsidiaries (other than Transit) and Symtron for such
     period, determined in conformity with GAAP consistently applied, plus,
     to the extent deducted in determining such net income but without
     duplication, Interest Expense for such period and provision for taxes
     applicable to such period.

               "EBITDA":  for any period, EBIT for such period, adjusted by
     adding thereto the amount of depreciation and amortization deducted in
     determining EBIT for such period.



























     
<PAGE>

<PAGE>
     

               "ELIGIBLE ACCOUNTS":  at a particular time, the aggregate
     amount, as at such time, of accounts of the Borrower and Eligible
     Affiliates which have been billed to the account debtors thereon,
     which are payable in conformity with such billings and which are, but
     only in the amounts such accounts are, acceptable to the Agent as at
     such time, in the discretion of the Agent exercised in good faith, as
     a basis for extensions of credit to the Borrower under this Agreement. 
     Except as otherwise agreed by the Agent from time to time, Eligible
     Accounts shall not include:  (a) any account which has remained unpaid
     for ninety (90) days or more after the billing thereof; (b) any
     account due from any Person other than the United States of America if
     fifty percent (50%) or more of all of the accounts due to the Borrower
     and Eligible Affiliates from such Person has remained unpaid for
     ninety (90) days or more after the billing thereof; (c) any account
     which arose out of any contract with the United States of America if
     fifty percent (50%) or more of the total amount due under such
     contract has remained unpaid for ninety (90) days or more after the
     billing thereof; (d) any account which is not lawfully owned by the
     Borrower or an Eligible Affiliate, which has been assigned to the
     Borrower or an Eligible Affiliate, which is subject to any Lien except
     for Permitted Liens, or in which the Borrower or the Eligible
     Affiliate, as the case may be, does not have the right and power to
     grant a security interest to the Agent in conformity with the Borrower
     Security Agreement, the Guarantor Security Agreement or the applicable
     Subsidiary Security Agreement, as the case may be, including any
     account the assignment of which is prohibited, limited or conditioned
     under any underlying or related contract; (e) any account with respect
     to which any transaction giving rise to or relating to the account was
     unlawful or not solicited and entered into in compliance with
     Requirements of Law; (f) any account which is not valid or enforceable
     or does not represent bona fide, undisputed Indebtedness to the
     Borrower or an Eligible Affiliate of each obligor thereon; (g) any
     account in which the Agent does not have a perfected first priority
     security interest; (h) any account evidenced in whole or in part by
     any instrument or chattel paper unless such instrument or chattel
     paper has been delivered to the Agent, together with such endorsements
     or assignments as the Agent may reasonably require; (i) any account to
     the extent that the account is subject to any defense, setoff,
     counterclaim, credit, discount, allowance, adjustment, deduction or
     reduction of any kind; (j) any account to the extent that such account
     includes any finance or similar charges on account of past due
     amounts; (k) any account with respect to which any obligor thereon is
     a Person of whom the Borrower or the Eligible Affiliate, as the case
     may be, is or becomes an account debtor or obligor by virtue of any
     obligation of the Borrower or such Eligible Affiliate to such Person
     not relating to accounts due or to become due from such Person to the
     Borrower or such Eligible Affiliate; (l) any account to the extent
     that any goods, the sale or lease of which gave rise to the account,
     have been returned, rejected, lost or damaged prior to acceptance of
     such goods by the purchaser or lessee thereof; (m) any account which
     arose from the sale of goods, if such sale was not an absolute sale or
     was a sale on consignment, on approval or on a sale-or-






















     
<PAGE>

<PAGE>
     

     return basis, or if such sale is subject to any repurchase or return
     agreement, or if such sale is subject to any other term by reason of
     which the obligation of any obligor thereon is contingent or
     conditional; (n) any account which did not arise in the ordinary
     course of business of the Borrower or the Eligible Affiliate, as the
     case may be; (o) any account which arose out of a contract with the
     United States of America or any state, county, municipality or other
     Governmental Authority, or any department or agency thereof, to the
     extent that sums due or to become due in connection therewith have not
     been duly assigned to the Agent in accordance with the Federal
     Assignment of Claims Act and/or any other applicable federal, state
     and local laws, rules and regulations relating to the assignment or
     payment of such contract and sums; (p) any account with respect to
     which any obligor thereon is insolvent (as defined in Section 101(32
     of the United States Bankruptcy Code), is unable to pay its debts as
     they mature, or is the subject of any pending, imminent or threatened
     bankruptcy, reorganization, insolvency, readjustment of debt,
     trusteeship, receivership, dissolution or liquidation law, statute or
     proceeding; (q) any account which arose out of a contract which is
     subject to any bonding or other similar arrangement as security for
     any obligations of the Borrower, any of its Subsidiaries or any
     Guarantor in connection with which any Lien has been granted, incurred
     or assumed upon any property, assets or revenues, whether now owned or
     hereafter acquired, of any of Borrower, any of its Subsidiaries or any
     Guarantor; (r) any account with respect to which any obligor thereon
     is an Affiliate of the Borrower or any Other Obligor; (s) any account
     with respect to which the principal place of business of any obligor
     thereon is not located in the United States of America, except to the
     extent that such account is (i) secured by a letter of credit or bond
     satisfactory to the Agent issued or confirmed by a bank or provided by
     a surety which is satisfactory to the Agent and which is organized
     under the laws of the United States of America or any state thereof or
     (ii) guaranteed by the United States of America or an agency thereof
     on terms and conditions satisfactory to the Agent; or (t) any account
     which arose out of a contract with the United States of America or any
     other Governmental Authority to the extent that (i) funds for the
     payment of such account have not been appropriated by the United
     States of America or such other Governmental Authority or (ii) the
     Agent is not satisfied, in its discretion exercised in good faith,
     that such account and contract is enforceable against the full faith
     and credit of the United States of America or such other Governmental
     Authority and that funds for the payment of such account are
     available.  Notwithstanding the provisions of clause (s) of this
     definition, accounts of the Borrower due from Marubun Corporation, a
     Japanese corporation ("Marubun"), which otherwise qualify as Eligible
     Accounts may constitute Eligible Accounts even though they would
     otherwise be excluded by such clause (s), provided that, except as
                                               --------
     otherwise agreed by the Agent from time to time:  (i) notwithstanding
     the provisions of clause (a) of this definition, no account of the
     Borrower due from Marubun shall constitute an Eligible Account if such
     account has remained unpaid for thirty (30) days or more after the
     billing thereof; (ii) notwithstanding the





















     
<PAGE>

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     provisions of clause (b) of this definition, no account of the
     Borrower due from Marubun shall constitute an Eligible Account if
     fifty percent (50%) or more of all of the accounts due to the Borrower
     and Eligible Affiliates from such Person has remained unpaid for
     thirty (30) days or more after the billing thereof; and (iii) the
     product of (x) the Accounts Credit Percentage and (y) the aggregate
     amount of accounts of the Borrower due from Marubun constituting
     Eligible Accounts, shall not at any time exceed Two Hundred Fifty
     Thousand Dollars ($250,000.00).  The Agent may determine from time to
     time in its discretion exercised in good faith and notwithstanding any
     previous contrary determinations made by the Agent, to exclude from or
     include in Eligible Accounts specific accounts (including accounts due
     from Marubun), categories or types of accounts (including accounts due
     from Marubun), or specific components of accounts (including accounts
     due from Marubun).  Such determinations may be based upon evaluations
     of risk by the Agent or any other factors deemed relevant by the
     Agent, whether or not such factors have theretofore been used,
     contemplated or foreseen as a basis for limiting Eligible Accounts. 
     Any such determinations by the Agent will be promptly communicated in
     writing to the Borrower.

               "ELIGIBLE AFFILIATE":  at a particular time (a) each
     Eligible Borrower Subsidiary as at such time and (b) Symtron, provided
                                                                   --------
      that the Guaranty is subsisting as at such time with respect to
     Symtron, the Guarantor Security Agreement is subsisting as at such
     time with respect to Symtron and that the security interests granted
     by Symtron pursuant to the Guarantor Security Agreement are duly
     perfected as at such time and subject only to Permitted Liens.

               "ELIGIBLE BORROWER SUBSIDIARY":  at a particular time, a
     Subsidiary of the Borrower which has executed and delivered to the
     Agent a Subsidiary Guaranty subsisting as at such time, a Subsidiary
     Security Agreement subsisting as at such time, such financing
     statements as may be required by the Agent and such other documents
     and instruments as may be required pursuant to any of the Credit
     Documents, provided that the security interests granted by such
                --------
     Subsidiary pursuant to such Subsidiary Security Agreement are duly
     perfected as at such time and subject only to Permitted Liens.

               "ENGINEERING":  AAI Engineering Support Inc., a Maryland
     corporation.

               "ENVIRONMENTAL ASSESSMENT":  an environmental site
     assessment, including such audits, tests and procedures as the Agent,
     the Borrower or the contractor performing the same may deem necessary,
     together with a written report thereon, performed and prepared by an
     experienced, responsible and reputable contractor satisfactory to the
     Agent.
























     
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               "ENVIRONMENTAL CLAIM":  shall mean any letter, notice,
     claim, demand, summons, citation, directive or other written
     communication and any investigation, action, suit, proceeding,
     litigation, judgment or decree by or from the United States
     Environmental Protection Agency or any other Person alleging or
     otherwise relating to any Hazardous Substance Contamination or any
     violation of any Environmental Law.

               "ENVIRONMENTAL LAWS":  the Resource Conservation and
     Recovery Act, the Comprehensive Environmental Response, Compensation
     and Liability Act, the Toxic Substances Control Act, the Federal
     Insecticide, Fungicide, and Rodenticide Act, the Federal Water
     Pollution Control Act, the Safe Drinking Water Act, the Clean Air Act,
     the Solid Waste Disposal Act, the Emergency Planning and Community
     Right-To-Know Act, as each of the foregoing may be amended from time
     to time, and all rules, regulations, codes, orders, decrees,
     judgments, injunctions, notices and demand letters now or hereafter
     enacted, promulgated, approved, issued or entered thereunder, as the
     same may be amended from time to time, and all other federal, state,
     local and foreign laws, rules, regulations, codes, permits,
     directives, orders, decrees, judgments, injunctions, notices and
     demand letters now or hereafter enacted, promulgated, approved, issued
     or entered, and as amended from time to time, relating to the
     protection of the health of human beings or other living things or
     relating to pollution or protection of air, water, land or any other
     aspect of the environment, including, without limitation, all of the
     same relating to the presence, manufacture, generation, production,
     processing, use, handling, treatment, storage, disposal, importation,
     transportation, distribution or registration, or the release,
     emission, discharge or spilling into air, water, land or any other
     aspect of the environment, of any Hazardous Substance.

               "ERISA":  the Employee Retirement Income Security Act of
     1974, as amended from time to time.

               "EUROCURRENCY RESERVE REQUIREMENTS":  for any day as applied
     to a Eurodollar Loan, the aggregate (without duplication) of the rates
     (expressed as a decimal fraction) of reserve requirements in effect on
     such day (including, without limitation, basic, supplemental, marginal
     and emergency reserves under any regulations of the Board of Governors
     of the Federal Reserve System or other Governmental Authority having
     jurisdiction with respect thereto), dealing with reserve requirements
     prescribed for eurocurrency funding (currently referred to as
     "Eurocurrency Liabilities" in Regulation D of such Board) maintained
     by a member bank of such System.

               "EURODOLLAR BASE RATE":  with respect to each day during
     each Interest Period pertaining to a Eurodollar Loan, the rate per
     annum for deposits in Dollars for a period equal to such Interest
     Period which appears on the Telerate Page 3750 as of 11:00 A.M.,
     London























     
<PAGE>

<PAGE>
     

     time, on the day that is two (2) Working Days prior to the
     commencement of such Interest Period.  If such rate does not appear on
     the Telerate Page 3750, the rate to be utilized shall be the offered
     rate which appears, or if two or more such rates appear, the average
     (rounded up to the next higher 1/16 of 1%) of the offered rates which
     appear, on the Reuters Screen LIBO Page as of 11:00 A.M., London time,
     on the day that is two (2) Working Days prior to the commencement of
     such Interest Period.

               "EURODOLLAR LENDING OFFICE":  initially, the office of each
     Lender designated as such in Schedule II; thereafter, such other
     office of such Lender, if any, which shall be making or maintaining
     Eurodollar Loans.

               "EURODOLLAR LOANS":  Revolving Credit Loans hereunder at
     such time as they are made and/or are being maintained at a rate of
     interest based upon the Eurodollar Rate.

               "EURODOLLAR RATE":  with respect to each day during each
     Interest Period pertaining to a Eurodollar Loan, a rate per annum
     determined for such day in accordance with the following formula
     (rounded upwards to the nearest whole multiple of 1/100th of one
     percent):

                              Eurodollar Base Rate              
                ------------------------------------------------
                    1.00 - Eurocurrency Reserve Requirements

               "EVENT OF DEFAULT":  any of the events specified in
     Section 8.

               "EXISTING BORROWER SUBSIDIARIES":  the collective reference
     to Systems, Technologies, Engineering, Transit, Carshell,
     International, Microflite, Medical and Seti.

               "FEDERAL FUNDS RATE":  with respect to each day during any
     period, a fluctuating per annum rate of interest equal for each day
     during such period to the weighted average of the rates on overnight
     Federal funds transactions with members of the Federal Reserve System
     arranged by Federal funds brokers, as published for such day (or, if
     such day is not a Business Day, for the next preceding Business Day)
     by the Federal Reserve Bank of Philadelphia, or, if such rate is not
     so published for any day which is a Business Day, the average of the
     quotations for such day on such transactions received by the Agent
     from three Federal funds brokers of recognized standing selected by
     it.

               "FINANCING LEASE":  in the case of any Person, any lease of
     any property (real, personal or mixed) by such Person as lessee which,
     in conformity with GAAP, would be required to be capitalized on a
     balance sheet of such Person.























     
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               "FIRST FIDELITY":  First Fidelity Bank, National
     Association.

               "FIRST FIDELITY CASH COLLATERAL ACCOUNT":  the Cash
     Collateral Account established at First Fidelity.

               "GAAP":  generally accepted accounting principles in the
     United States of America in effect from time to time.  In the event of
     a change in GAAP affecting any of the covenants contained in
     Subsection 7.1 or definitions contained in Section 1 relating to such
     covenants, such covenants and definitions shall continue to be applied
     as though such change in GAAP had not occurred unless and until the
     Borrower and the Required Lenders shall agree in writing to amend or
     adjust such covenants or definitions as deemed necessary as a result
     of such change in GAAP.

               "GOOD FAITH":  with respect to any determination, request or
     other action to be made or taken by any party hereto "in good faith,"
     that such party shall make or take such determination, request or
     other action honestly and not maliciously.

               "GOVERNMENTAL AUTHORITY":  any nation or government, any
     state or other political subdivision thereof and any entity exercising
     executive, legislative, judicial, regulatory or administrative
     functions of or pertaining to government, and any Person owned or
     controlled directly or indirectly by any of the foregoing, whether
     domestic or foreign.

               "GUARANTOR SECURITY AGREEMENT":  as amended, modified,
     extended, renewed, supplemented or replaced from time to time, the
     Security Agreement to be executed and delivered by the Guarantors
     (other than UIC) in favor of the Agent, for the ratable benefit of the
     Lenders, the Issuing Bank and the Private Placement Debt Holders,
     pursuant to which each of the Guarantors (other than UIC) shall, among
     other things, grant to the Agent a security interest in all of its
     present and future accounts, chattel paper, instruments, documents of
     title, general intangibles, equipment, inventory and other assets.

               "GUARANTORS":  the collective reference to UIC, Symtron,
     UIC-DEL, Systems, Technologies, Engineering, Carshell, International,
     Microflite, Medical, Seti and each other Subsidiary of the Borrower
     which after the date of this Agreement executes and delivers to the
     Agent a Subsidiary Guaranty.

               "GUARANTY":  as amended, modified, extended, renewed,
     supplemented or replaced from time to time, the Guaranty to be
     executed and delivered by the Guarantors in favor of the Agent, the
     Lenders and the Issuing Bank pursuant to which each of the


























     
<PAGE>

<PAGE>
     

     Guarantors shall, among other things, guarantee payment of the
     Obligations jointly and severally with each other of the Guarantors.

               "HAZARDOUS SUBSTANCE":  any hazardous substance, hazardous
     material, hazardous waste, toxic substance, toxic material, toxic
     waste, industrial waste, medical waste, infectious waste, biomedical
     waste, biohazardous waste, pollutant, contaminant, chemical, acid,
     solvent, caustic, oil, petroleum, petroleum-based product, asbestos,
     asbestos-containing substance or material, flammable substance,
     flammable material, explosive substance, explosive material, radon,
     radioactive substance, radioactive material, urea formaldehyde foam
     insulation, polychlorinated biphenyls, methane and any other substance
     or material the presence, manufacture, generation, production,
     processing, use, handling, treatment, storage, disposal, release,
     emission, discharge, spilling, importation, transportation,
     distribution or registration of which is prohibited or regulated by
     any Environmental Law.  The meaning of each term used in this
     definition shall include, without limitation, the meaning or meanings
     assigned to such term by any Environmental Laws.

               "HAZARDOUS SUBSTANCE CONTAMINATION":   (a) the
     contamination, as a result of any Hazardous Substance, of any Obligor
     Use Property; or (b) the contamination, as a result of any
     manufacture, generation, production, processing, use, handling,
     treatment, storage, disposal, release, emission, discharge or spilling
     of any Hazardous Substance on or from any Obligor Use Property, of any
     surrounding, adjacent or nearby air, water, land or other property or
     other aspect of the environment which requires remedial action under
     any Environmental Law.

               "INDEBTEDNESS":  as to any Person, without duplication: 
     (a) any obligation, indebtedness or liability of such Person which, in
     conformity with GAAP, should be included in the liability section of a
     balance sheet of such Person or in a note to the liability section of
     a balance sheet of such Person, excluding reserves to the extent that
     such reserves do not constitute obligations; (b) any obligation,
     indebtedness or liability of such Person arising under any conditional
     sale or other title retention agreement with respect to property
     acquired by such Person, notwithstanding that the remedies of the
     seller, lender or lessor under such agreement in case of default are
     limited to repossession or sale of property; (c) any obligation,
     indebtedness or liability of any Person secured directly or indirectly
     by any contingent or noncontingent security interest or other Lien in
     or upon any present or future property of such Person, whether or not
     such Person is personally liable for such obligation, indebtedness or
     liability; and (d) any obligation, indebtedness or liability of such
     Person in connection with any Financing Lease.



























     
<PAGE>

<PAGE>
     

               "INDEMNIFIED LETTERS OF CREDIT":  the collective reference
     to the letters of credit issued by Signet Bank/Maryland for the
     account of the Borrower and subject to the Issuing Bank L/C
     Indemnification Agreement.

               "INDUSTRY LANE REAL PROPERTY PROPOSED TO BE SOLD":  the
     collective reference to the real property described in Schedule III,
     together with all improvements thereon.

               "INSOLVENCY" or "INSOLVENT":  at any particular time, a
     Multiemployer Plan which is insolvent within the meaning of Section
     4245 of ERISA.

               "INTELLECTUAL PROPERTY ASSIGNMENT":  as amended, modified,
     extended, renewed, supplemented or replaced from time to time, an
     assignment in form and content satisfactory to the Required Lenders
     assigning to the Agent, for the ratable benefit of the Agent, the
     Lenders, the Issuing Bank and the Private Placement Debt Holders,
     rights of the Borrower or any other Person relating to any patent
     rights, trademark rights, servicemark rights, copyright rights,
     license rights or other intellectual property.

               "INTERCREDITOR AGREEMENT":  as amended, modified, extended,
     renewed, supplemented or replaced from time to time, an Intercreditor
     Agreement in form and content satisfactory to the Agent, the Issuing
     Bank and the Lenders to be executed and delivered among the Agent, the
     Issuing Bank, the Lenders and the Private Placement Debt Holders
     pursuant to which the relative rights of the Lenders, the Issuing Bank
     and the Private Placement Debt Holders relating to Collateral and
     other relative rights of the parties thereto shall be established.

               "INTEREST EXPENSE":  for any period, the total interest
     expense of the Borrower, its Subsidiaries (other than Transit) and
     Symtron for such period on a consolidated basis.

               "INTEREST PAYMENT DATE":  (a) as to any Base Rate Loan, the
     first day of each month, and (b) as to any Eurodollar Loan, the first
     day of each month and the last day of the Interest Period applicable
     thereto.

               "INTEREST PERIOD":  as to any Eurodollar Loan:

               (a)  initially, the period commencing on the borrowing or
          conversion date, as the case may be, with respect to such
          Eurodollar Loan and ending one (1), three (3) or six (6) months
          thereafter, as selected by the Borrower in its notice of




























     
<PAGE>

<PAGE>
     

          borrowing as provided in Subsection 2.3 or its notice of
          conversion as provided in Subsection 2.9, as the case may be; and

               (b)  thereafter, each period commencing on the last day of
          the next preceding Interest Period applicable to such Eurodollar
          Loan and ending one (1), three (3) or six (6) months thereafter,
          as selected by the Borrower by irrevocable notice to the Agent
          not less than five (5) Working Days prior to the last day of the
          then current Interest Period with respect to such Eurodollar
          Loan;

     provided that all of the foregoing provisions relating to Interest
     --------
     Periods are subject to the following:

               (i)  if any Interest Period with respect to a Eurodollar
          Loan would otherwise end on a day which is not a Working Day,
          that Interest Period shall be extended to the next succeeding
          Working Day unless the result of such extension would be to carry
          such Interest Period into another calendar month, in which event
          such Interest Period shall end on the immediately preceding
          Working Day;

               (ii) no Interest Period shall end after the Termination
          Date;

               (iii)     if the Borrower shall fail to give notice as
          provided above, the Borrower shall be deemed to have selected a
          Base Rate Loan to replace the affected Eurodollar Loan;

               (iv) any Interest Period with respect to a Eurodollar Loan
          that begins on the last Working Day of a calendar month (or on a
          day for which there is no numerically corresponding day in the
          calendar month at the end of such Interest Period) shall end on
          the last Working Day of a calendar month; and

               (v)  the Borrower shall select Interest Periods so as not to
          require a payment or prepayment of any Eurodollar Loan during an
          Interest Period for such Loan.

               "INTERNATIONAL":  AAI International, Inc., a Delaware
     corporation.

               "INVESTMENT":  legal or beneficial ownership of any capital
     stock, partnership interest, joint venture interest  or other equity
     interest in, or any promissory note, bond, debenture or other
     Indebtedness of or issued by, or any capital contribution to, or any
     other investment in or security (as defined in the Securities Act of
     1933 or the Securities Exchange

























     
<PAGE>

<PAGE>
     

     Act of 1934, or any successor legislation, as amended from time to
     time) of or issued by, any corporation, partnership, joint venture or
     other Person.

               "ISSUING BANK":  as of the date of this Agreement, First
     Fidelity and, after the date of this Agreement, the Person from time
     to time party to this Agreement as "Issuing Bank."

               "ISSUING BANK L/C INDEMNIFICATION AGREEMENT":  as amended,
     modified, extended, renewed, supplemented or replaced from time to
     time, a letter agreement to be executed and delivered between the
     Issuing Bank and Signet Bank/Maryland, satisfactory in form and
     content to the Issuing Bank, pursuant to which the Issuing Bank shall
     indemnify Signet Bank/Maryland in connection with certain letters of
     credit issued by Signet Bank/Maryland for the account of the Borrower.

               "L/C AGGREGATE UNDRAWN AMOUNT":  at a particular date, the
     aggregate undrawn amount, as at such date, of all Letters of Credit
     and all Indemnified Letters of Credit issued and outstanding.

               "L/C AGREEMENTS":  as amended, modified, extended, renewed,
     supplemented or replaced from time to time, applications and
     reimbursement and other agreements in form and content and executed by
     Persons satisfactory to the Issuing Bank requesting issuance of one or
     more Letters of Credit and setting forth reimbursement obligations and
     other terms and conditions relating thereto.

               "L/C APPLICATION":  in the case of a commercial Letter of
     Credit, an Application in the form of Exhibit A or in such other form
     as the Issuing Bank may from time to time require, appropriately
     completed and duly executed, and, in the case of a standby Letter of
     Credit, an application in the form of Exhibit B or in such other form
     as the Issuing Bank may from time to time require, appropriately
     completed and duly executed.

               "L/C COMMITMENT":  as defined in Subsection 3.1.

               "L/C EXPOSURE":  at a particular time, the sum of (a) the
     L/C Aggregate Undrawn Amount as at such time and (b) L/C Reimbursement
     Obligations as at such time.

               "L/C MAXIMUM EXPOSURE":  Ten Million Dollars
     ($10,000,000.00).

               "L/C REIMBURSEMENT OBLIGATIONS":  at a particular time, the
     aggregate amount of all drawings made under Letters of Credit and
     Indemnified Letters of Credit



























     
<PAGE>

<PAGE>
     

     which, as at such time, have not been reimbursed by the Borrower to
     the Issuing Bank or Signet Bank/Maryland, as the case may be.

               "LENDERS":  as of the date of this Agreement, First Fidelity
     and The Bank of Baltimore and, after the date of this Agreement, all
     Persons from time to time parties to this Agreement as "Lenders."

               "LETTERS OF CREDIT":  as defined in Subsection 3.1.

               "LEVERAGE RATIO":  at a particular date, the ratio of
     (a) Senior Liabilities as at such date to (b) Capital Base as at such
     date.

               "LIEN":  any mortgage, pledge, hypothecation, assignment,
     deposit arrangement, encumbrance, lien (statutory or other) or
     preference, priority or other security agreement or preferential
     arrangement of any kind or nature whatsoever (including, without
     limitation, any conditional sale or other title retention agreement,
     any Financing Lease having substantially the same economic effect as
     any of the foregoing, and the filing of any financing statement under
     the Uniform Commercial Code or comparable law of any jurisdiction in
     respect of any of the foregoing).

               "LOAN":  any Revolving Credit Loan.

               "LONG-TERM DEBT":  at a particular time, all Indebtedness of
     the Borrower, each of its Subsidiaries (other than Transit) and
     Symtron as at such time which was payable more than one (1) year from
     the date of creation of such Indebtedness (excluding reserves for
     deferred income taxes and other reserves to the extent that such
     reserves do not constitute obligations).

               "MATERIAL ADVERSE EFFECT":  a material adverse effect with
     respect to the business, assets, operations, business prospects or
     financial condition of the Borrower, any of its Subsidiaries or any
     Other Obligor, or a material adverse effect with respect to the risks
     to the Lenders or the Issuing Bank attending the Collateral, with
     respect to the risks to the Lenders or the Issuing Bank attending any
     commitments of the Lenders or the Issuing Bank which could give rise
     to any Obligations, or with respect to the prospect for payment or
     collection in full of the Obligations; provided that the failure of
                                            --------
     Transit to be awarded a contract by the Miami Valley Transit Authority
     for the supply of electric trolley buses shall not be deemed to have a
     "Material Adverse Effect." 





























     
<PAGE>

<PAGE>
     

               "MATERIAL LITIGATION":  in the case of any Person, any
     litigation, action, suit, proceeding or investigation pending or
     overtly threatened against such Person or any Subsidiary of such
     Person, or any of their property, at law or in equity, which, if
     determined adversely to such Person or such Subsidiary, as the case
     may be, could reasonably be expected to have a material adverse effect
     on the business, assets, operations, business prospects or financial
     condition of such Person or any Subsidiary of such Person, or a
     material adverse effect with respect to the risks to the Lenders or
     the Issuing Bank attending the Collateral, with respect to the risks
     to the Lenders or the Issuing Bank attending any commitments of the
     Lenders or the Issuing Bank which could give rise to any Obligations,
     or with respect to the prospect for payment or collection in full of
     the Obligations.

               "MEDICAL":  AAI Medical Corporation, a Maryland corporation.

               "MICROFLITE":  AAI Microflite Simulation International
     Corporation, a Maryland corporation.

               "MULTIEMPLOYER PLAN":  a Plan which is a multiemployer plan
     as defined in Section 4001(a) (3) of ERISA.

               "NOTES":  the collective reference to the Revolving Credit
     Notes.

               "OBLIGATIONS":  as amended, modified, extended, renewed,
     supplemented, increased, refinanced, consolidated or replaced from
     time to time, all present and future Indebtedness of the Borrower to
     the Agent, the Lenders and the Issuing Bank of every kind and nature
     arising under or in connection with this Agreement or the other Credit
     Documents (including, without limitation, all Revolving Credit Loans,
     L/C Reimbursement Obligations and all other principal amounts,
     including future advances, interest charges, fees, commissions,
     indemnification obligations and all other charges and sums, as well as
     all costs and expenses, including attorneys' fees and expenses,
     payable or reimbursable by the Borrower under or pursuant to this
     Agreement and the other Credit Documents), whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, secured or unsecured, whether or
     not now contemplated, whether arising in contract, tort or otherwise,
     including, without limitation, all claims against the Borrower arising
     or re-arising on account of or as a result of any payment made by the
     Borrower or any Other Obligor with respect to any obligations included
     in this definition which is rescinded or recovered from or restored or
     returned by the Agent, any Lender or the Issuing Bank under authority
     of any law, rule, regulation, order of court or Governmental
     Authority, or in connection with any compromise or settlement relating
     thereto

























     
<PAGE>

<PAGE>
     

     or relating to any pending or threatened action, suit or proceeding
     relating thereto, whether arising out of any proceedings under the
     United States Bankruptcy Code or otherwise.

               "OBLIGOR USE PROPERTY":  the collective reference to any
     real property owned, leased, subleased, occupied, used or operated by
     the Borrower, any of its Subsidiaries, Symtron or any Other Obligor.

               "OFFICER DEFAULT CERTIFICATE":  an appropriately completed
     certificate in form substantially similar to Exhibit C, but in form
     and content satisfactory to the Required Lenders, signed by the chief
     financial officer of the Borrower certifying whether, as at a
     particular time and to the knowledge and belief of such officer after
     diligent inquiry, any Default or Event of Default existed and, if so,
     setting forth all relevant facts with respect thereto.

               "OFFICER FINANCIAL COVENANT CERTIFICATE":  an appropriately
     completed certificate substantially similar to Exhibit D, but in form
     and content satisfactory to the Required Lenders, signed by the chief
     financial officer of the Borrower setting forth calculations of the
     covenants contained in Subsection 7.1 as at a particular time or for a
     particular period.

               "OFFICER RELIANCE CERTIFICATE":  an appropriately completed
     certificate substantially similar to Exhibit E, but in form and
     content satisfactory to the Required Lenders, signed by the chief
     financial officer of the Borrower certifying that financial statements
     with respect to which such certificate is issued present fairly in all
     material respects the financial position of the Borrower and its
     Subsidiaries as at a particular time and the results of operations of
     the Borrower and its Subsidiaries for the period or periods ending at
     such time, subject to normal year-end adjustments.

               "OTHER OBLIGOR":  each of the Guarantors and each other
     Person other than the Borrower that is now or hereafter primarily or
     secondarily, or contingently or noncontingently, liable for or
     obligated upon or in connection with any of the Obligations, or,
     whether or not so liable, that has granted any lien or security
     interest to or for the benefit of the Lenders as security for any of
     the Obligations or any obligations of any other Person in connection
     with any of the Obligations.

               "PBGC":  the Pension Benefit Guaranty Corporation
     established pursuant to Subtitle A of Title IV of ERISA.






























     
<PAGE>

<PAGE>
     

               "PERMITTED EQUIPMENT PMSI":  any purchase money security
     interest (including Financing Leases, leases intended as security and
     title retention agreements) created under the Uniform Commercial Code
     of any jurisdiction in equipment of the Borrower, any of its
     Subsidiaries or Symtron, provided that (a) such security interest is
     assumed or created by the Borrower, such Subsidiary or Symtron
     contemporaneously with the Borrower's, such Subsidiary's or Symtron's
     acquisition of rights in such equipment, (b) such security interest
     secures no obligations of the Borrower, such Subsidiary or Symtron
     other than Indebtedness incurred by the Borrower, such Subsidiary or
     Symtron in connection with the acquisition of such equipment, (c) such
     security interest attaches to no property of the Borrower, such
     Subsidiary or Symtron other than such equipment and the proceeds
     thereof, (d) such security interest becomes junior and subordinate to
     the Agent's security interest in such equipment and the proceeds
     thereof upon the Borrower's, such Subsidiary's or Symtron's payment of
     such Indebtedness incurred in connection with the acquisition of such
     equipment, and (e) neither the assumption or creation by the Borrower,
     such Subsidiary or Symtron of such security interest nor incurrence by
     the Borrower, such Subsidiary or Symtron of such Indebtedness violates
     any provision of this Agreement or any of the other Credit Documents.

               "PERMITTED LIENS":  as defined in Subsection 7.3.

               "PERSON":  an individual, partnership, corporation, limited
     liability company, business trust, joint stock company, trust,
     unincorporated association, joint venture, Governmental Authority or
     other entity of whatever nature.

               "PIONEER":  Pioneer U.A.V., Inc., a Delaware corporation.

               "PLAN":  at a particular time, any employee benefit plan
     which is covered by ERISA and in respect of which the Borrower, any
     Other Obligor or a Commonly Controlled Entity is (or, if such plan
     were terminated at such time, would under Section 4069 of ERISA be
     deemed to be) an "employer" as defined in Section 3(5) of ERISA.

               "PREPAYMENT PREMIUM":  in the case of any Compensable
     Prepayment, a premium in an amount equal to one percent (1%) of the
     amount of such Compensable Prepayment.

               "PRIVATE PLACEMENT DEBT":  the Indebtedness of the Borrower
     to the Private Placement Debt Holders pursuant to the Private
     Placement Debt Documents.






























     
<PAGE>

<PAGE>
     

               "PRIVATE PLACEMENT DEBT BALANCE":  at a particular time, the
     unpaid principal balance of the Private Placement Debt as at such
     time.

               "PRIVATE PLACEMENT DEBT DOCUMENTS":  the collective
     reference to the Note Purchase Agreement dated as of July 15, 1994,
     among the Borrower and the Private Placement Debt Holders, the
                           -
     promissory notes of the Borrower issued pursuant thereto and each
     other agreement, contract, promissory note or other instrument,
     security agreement, assignment, pledge agreement, indemnification
     agreement, subordination agreement, mortgage, deed of trust, guaranty
     and other documents now or hereafter evidencing, guaranteeing,
     securing (directly or indirectly), subordinating other obligations of
     the Borrower or any Guarantor to, or containing any warranties,
     covenants, agreements or representations of any Person relating to,
     any Indebtedness or liability of the Borrower or any Guarantor arising
     under such Note Purchase Agreement or such promissory notes, as each
     of the documents referred to in this definition have been or may
     hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time.

               "PRIVATE PLACEMENT DEBT HOLDERS":  the collective reference
     to Principal Mutual Life Insurance Company, an Iowa corporation, and
     The Travelers Insurance Company, a Connecticut corporation, their
     successors and assigns.

               "REAL PROPERTY COLLATERAL":  the collective reference to the
     real property described in Schedule IV, together with all improvements
     now or hereafter constructed or placed on such real property and
     related rights and interests.

               "REORGANIZATION":  with respect to any Multiemployer Plan,
     the condition that such plan is in reorganization within the meaning
     of such term as used in Section 4241 of ERISA.

               "REPORTABLE EVENT":  any of the events set forth in Section
     4043(b) of ERISA, other than those events as to which the thirty day
     notice period is waived under subsections .13, .14, .16, .l8, .19 or
     .20 of PBGC Reg. Section 2615.

               "REQUIRED LENDERS":  at a particular time, a Lender or
     Lenders holding more than sixty percent (60%) of the Aggregate Loans
     Outstanding of all Lenders as at such time or, if no Lender has any
     Revolving Credit Loans outstanding, a Lender or Lenders whose
     Commitment Percentages aggregate more than sixty percent (60%) as at
     such time.

               "REQUIREMENT OF LAW":  as to any Person, the certificate of
     incorporation and by-laws or other organizational or governing
     documents of such Person, and any law, treaty,























     
<PAGE>

<PAGE>
     

     rule or regulation or determination of an arbitrator or a court or
     other Governmental Authority, in each case applicable to or binding
     upon such Person or any of its property or to which such Person or any
     of its property is subject.

               "RESTRICTED PAYMENT":  any payment or other transfer of
     money or other tangible or intangible property of any kind of the
     Borrower, any of its Subsidiaries or any Guarantor to any Affiliate of
     any of them, including, without limitation, any dividend or other
     distribution on account of capital stock or other securities, any
     loan, advance or capital contribution, any repayment of any loan,
     advance or capital contribution, any redemption or other repurchase of
     any securities, and any payment for services.

               "REUTERS SCREEN LIBO PAGE":  the display designated as page
     "LIBO" on the Reuter Monitor Money Rates Service (or such other page
     as may replace the LIBO page on that Service for the purpose of
     displaying London interbank offered rates of major banks).

               "REVOLVING CREDIT COMMITMENT":  as defined in
     Subsection 2.1.

               "REVOLVING CREDIT LOAN":  as defined in Subsection 2.1.

               "REVOLVING CREDIT NOTE":  as defined in Subsection 2.2.

               "SENIOR LIABILITIES":  at a particular date, Total
     Liabilities as at such date, exclusive of the UIC-DEL Standby
     Subordinated Debt Balance as at such date.

               "SINGLE EMPLOYER PLAN":  any Plan which is covered by Title
     IV of ERISA, but which is not a Multiemployer Plan.

               "SETI":  Seti, Inc., a Pennsylvania corporation.

               "STANDBY L/C COMMISSION RATE":  (a) one and three-quarters
     percent (1.75%) per annum at all times that the Private Placement Debt
     Balance is greater than Twelve Million Five Hundred Thousand Dollars
     ($12,500,000.00); (b) one and one-half percent (1.5%) per annum at all
     times that the Private Placement Debt Balance is greater than zero but
     less than or equal to Twelve Million Five Hundred Thousand Dollars
     ($12,500,000.00); and (c) one and one-quarter percent (1.25%) per
     annum at all times that the Private Placement Debt Balance is zero.

               "STANDBY L/C EXPOSURE":  at a particular time, the sum of
     (a) the L/C Aggregate Undrawn Amount as at such time which is
     attributable to standby Letters of Credit



























     
<PAGE>

<PAGE>
     

     and (b) L/C Reimbursement Obligations as at such time which are
     attributable to standby Letters of Credit.

               "STANDBY L/C MAXIMUM EXPOSURE":  Ten Million Dollars
     ($10,000,000.00).

               "SUBSIDIARY":  as to any Person, (a) a corporation of which
     shares of capital stock having voting power to elect a majority of the
     board of directors or other managers of such corporation are owned, or
     the management of which is otherwise controlled, directly or
     indirectly, or both, through one or more intermediaries, by such
     Person, and (b) any partnership, limited liability company,
     association, joint venture or other business entity of which more than
     fifty percent (50%) of the voting equity interests is owned, or the
     management of which is otherwise controlled, directly or indirectly,
     or both, through one or more intermediaries, by such Person.

               "SUBSIDIARY GUARANTY":  as amended, modified, extended,
     renewed, supplemented or replaced from time to time, a Guaranty in
     form substantially similar to the Guaranty, but in form and content
     satisfactory to the Required Lenders, pursuant to which a Subsidiary
     of the Borrower shall, among other things, guarantee payment of the
     Obligations.

               "SUBSIDIARY SECURITY AGREEMENT":  as amended, modified,
     extended, renewed, supplemented or replaced from time to time, a
     Security Agreement in form substantially similar to the Guarantor
     Security Agreement, but in form and content satisfactory to the
     Required Lenders, executed and delivered between the Agent and a
     Subsidiary of the Borrower pursuant to which such Subsidiary shall,
     among other things, grant to the Agent, for the ratable benefit of the
     Lenders, the Issuing Bank and the Private Placement Debt Holders, a
     security interest in all accounts, chattel paper, documents of title,
     general intangibles, instruments, equipment, inventory and other
     assets of such Subsidiary.

               "SYMTRON":  Symtron Systems, Inc., a New Jersey corporation.

               "SYSTEMS":  AAI Systems Management, Inc., a Maryland
     corporation.

               "TANGIBLE NET WORTH":  at a particular date, the amount
     (after any adjustment on account of FAS 87 of the Financial Accounting
     Standards Board) by which (a) the aggregate amount which, in
     conformity with GAAP, would be included in a total assets or
     comparable account reflected in a consolidated balance sheet of the
     Borrower, its Subsidiaries (other than Transit) and Symtron as at such
     date, exclusive of goodwill, trademarks, trade names, licenses and
     such other assets as are properly classified as intangible assets in
     conformity with GAAP, exclusive of all transactions with, and all
     amounts due or to become























     
<PAGE>

<PAGE>
     

     due to the Borrower, its Subsidiaries (other than Transit) or Symtron
     from, and all Investments in, Affiliates, exceeds (b) Total
     Liabilities as at such date.

               "TECHNOLOGIES":  AAI/ACL Technologies, Inc., a Maryland
     corporation.

               "TELERATE PAGE 3750":  the display designated as "Page 3750"
     on the Dow Jones Telerate Service (or such other page as may replace
     that page on that Service for the purpose of displaying London
     interbank offered rates of major banks).

               "TERMINATION DATE":  the earlier of (a) September 20, 1996,
     or (b) the date which is one hundred fifty (150) days after the date
     on which the Agent shall have given written notice to the Borrower, at
     the direction of the Required Lenders and whether or not an Event of
     Default shall have occurred, that the Obligations shall be due in full
     on such date.

               "TOTAL LIABILITIES":  at a particular date, the aggregate
     amount which, in conformity with GAAP, would be included in a total
     liabilities or comparable account reflected in a consolidated balance
     sheet of the Borrower, its Subsidiaries (other than Transit) and
     Symtron as at such date.

               "TOTAL USAGE":  as to any Lender at a particular date, the
     sum of (a) the Aggregate Loans Outstanding of such Lender as at such
     time, and (b) such Lender's Commitment Percentage of the L/C Exposure
     as at such time.

               "TRANCHE":  the collective reference to Eurodollar Loans
     having the same Interest Periods (whether or not originally made on
     the same day); Tranches may be identified as "Eurodollar Tranches".

               "TRANSIT":  Electric Transit, Inc., an Ohio corporation.

               "TRANSIT INVESTMENT":  any Investment in Transit after the
     date hereof, or any advance, loan or other extension of credit to
     Transit (including accounts due from Transit) after the date hereof.

               "TYPE":  as to any Revolving Credit Loan, its nature as a
     Base Rate Loan or an Eurodollar Loan.

               "UIC":  United Industrial Corporation, a Delaware
     corporation.





























     
<PAGE>

<PAGE>
     

               "UIC PLEDGE AGREEMENT":  as amended, modified, extended,
     renewed, supplemented or replaced from time to time, the Pledge and
     Security Agreement to be executed and delivered by UIC in favor of the
     Agent, for the ratable benefit of the Lenders, the Issuing Bank and
     the Private Placement Debt Holders, pursuant to which UIC shall, among
     other things, grant to the Agent a security interest in the UIC
     Subsidiary Pledged Stock.

               "UIC SUBSIDIARY PLEDGED STOCK":  all capital stock of each
     of AAI and Symtron owned by UIC as of the Closing Date.

               "UIC SUBORDINATED DEBT":  all present and future
     Indebtedness of the Borrower to UIC.

               "UIC SUBORDINATED DEBT BALANCE":  at a particular date, the
     aggregate principal amount of Indebtedness of the Borrower to UIC for
     loans by UIC to the Borrower which, as at such date, is subordinated
     on the terms and conditions set forth in the UIC Subordination
     Agreement.

               "UIC SUBORDINATION AGREEMENT":  as amended, modified,
     extended, renewed, supplemented or replaced from time to time, the
     Subordination Agreement to be executed and delivered by UIC in favor
     of the Agent, for the ratable benefit of the Lenders and the Issuing
     Bank, pursuant to which UIC shall subordinate the UIC Subordinated
     Debt to the Obligations on terms and conditions satisfactory to the
     Required Lenders.

               "UIC-DEL":  UIC - DEL. Corporation, a Delaware corporation.

               "UIC-DEL STANDBY SUBORDINATED DEBT":  at a particular date,
     Indebtedness of the Borrower to UIC-DEL (including the Indebtedness
     evidenced by the Creditor Note (as defined in the UIC-DEL
     Subordination Agreement)) with respect to which, as at such date, no
     payments of principal are permitted to be made under the UIC-DEL
     Subordination Agreement without the prior written consent of the Agent
     and which is otherwise subordinated on the terms and conditions set
     forth in the UIC-DEL Subordination Agreement.

               "UIC-DEL STANDBY SUBORDINATED DEBT BALANCE":  at a
     particular date, the aggregate principal amount of UIC-DEL Standby
     Subordinated Debt.

               "UIC-DEL SUBORDINATED DEBT":  all present and future
     Indebtedness of the Borrower to UIC-DEL.





























     
<PAGE>

<PAGE>
     

               "UIC-DEL SUBORDINATED DEBT BALANCE":  at a particular date,
     the aggregate principal amount of Indebtedness of the Borrower to UIC-
     DEL for loans by UIC-DEL to the Borrower which, as at such date, is
     subordinated on the terms and conditions set forth in the UIC-DEL
     Subordination Agreement.

               "UIC-DEL SUBORDINATION AGREEMENT":  as amended, modified,
     extended, renewed, supplemented or replaced from time to time, the
     Subordination Agreement to be executed and delivered by UIC-DEL in
     favor of the Agent, for the ratable benefit of the Lenders and the
     Issuing Bank, pursuant to which UIC-DEL shall subordinate the UIC-DEL
     Subordinated Debt to the Obligations on terms and conditions
     satisfactory to the Required Lenders.

               "YORK ROAD REAL PROPERTY PROPOSED TO BE SOLD":  the
     collective reference to the real property described in Schedule V,
     together with all improvements thereon.

               "WORKING DAY":  any Business Day on which dealings in
     foreign currencies and exchange between banks may be carried on in
     London, England.

               1.2  Other Definitional Provisions.  (a)  Unless otherwise
                    -----------------------------
     specified therein, all terms defined in this Agreement shall have the
     defined meanings when used in the Notes or any other Credit Document.

                    (b)  As used herein, in the Notes and in any other
     Credit Document, accounting terms not defined in Subsection 1.1 and
     accounting terms partly defined in Subsection 1.1, to the extent not
     defined, shall have the respective meanings given to them under GAAP.

                    (c)  As used herein, in the Notes and in any other
     Credit Document, terms defined by the Uniform Commercial Code as in
     effect in the State of Maryland on the date hereof shall, except to
     the extent that the context otherwise requires, have the respective
     meanings given to them under such Uniform Commercial Code.

                    (d)  Unless the context otherwise requires, each
     reference in this Agreement, the Notes or any other Credit Document to
     this Agreement, the Notes or any other Credit Document shall be deemed
     to refer to this Agreement, the Notes or such other Credit Document as
     the same may be amended, modified, extended, renewed, supplemented or
     replaced from time to time.






























     
<PAGE>

<PAGE>
     

                    (e)  The words "hereof", "herein" and "hereunder" and
     words of similar import when used in this Agreement shall refer to
     this Agreement as a whole and not to any particular provision of this
     Agreement, and Section, Subsection, Schedule and Exhibit references
     are to this Agreement unless otherwise specified.

                    (f)  The use of the singular in this Agreement shall
     also refer to the plural and vice versa, and the use of any gender,
     including the neuter, shall also refer to each of the other genders,
     including the neuter.

                    (g)  The captions and headings contained in this
     Agreement are for convenience of reference only and shall not affect
     the meaning, or the construction or interpretation, of this Agreement.

                    (h)  The phrases "satisfactory to the Required
     Lenders," "acceptable to the Required Lenders," "satisfactory to the
     Agent," "acceptable to the Agent," "satisfactory to the Issuing Bank,"
     and "acceptable to the Issuing Bank" and similar phrases shall mean
     satisfactory or acceptable to the Required Lenders, the Agent or the
     Issuing Bank, as the case may be, in their or its discretion exercised
     in good faith.

                    (i)  In the event of any inconsistency between any
     provisions of this Agreement and any provisions of any other Credit
     Document, the provisions of this Agreement shall control, but all of
     the provisions of this Agreement and the other Credit Documents shall
     be construed and interpreted so as to give effect, in the absence of
     irreconcilable conflict, to all of the provisions of this Agreement
     and other Credit Documents.


               SECTION 2.  AMOUNT AND TERMS OF LOAN COMMITMENTS

               2.1  Revolving Credit Commitments.  (a)  Subject to the
                    ----------------------------
     terms and conditions hereof, each Lender severally agrees to make
     revolving credit loans (individually, a "Revolving Credit Loan," and,
     collectively, the "Revolving Credit Loans") to the Borrower from time
     to time during the Commitment Period in an aggregate principal amount
     at any time outstanding not to exceed the amount set forth for such
     Lender in Schedule II (individually, a "Revolving Credit Commitment,"
     and, collectively, the "Revolving Credit Commitments"); provided that
                                                             --------
     at no time shall the Aggregate Borrowing Base Charge exceed the
     Borrowing Base.  During the Commitment Period and subject to the
     provisions hereof, the Borrower may use the Revolving Credit
     Commitments by borrowing, repaying the


























     
<PAGE>

<PAGE>
     

     Revolving Credit Loans in whole or in part, and reborrowing, all in
     accordance with the terms and conditions hereof.

                    (b)  The Revolving Credit Loans may be (i) Eurodollar
     Loans, (ii) Base Rate Loans, or (iii) a combination thereof, as
     determined by the Borrower and notified to the Agent in accordance
     with Subsection 2.3; provided that no Eurodollar Loan shall be made
                          --------
     after the day that is one month prior to the Termination Date. 
     Eurodollar Loans shall be made and maintained by each Lender at its
     Eurodollar Lending Office, and Base Rate Loans shall be made and
     maintained by each Lender at its Domestic Lending Office.

               2.2  Revolving Credit Notes.  The Revolving Credit Loans
                    ----------------------
     made by each Lender shall be evidenced by a promissory note of the
     Borrower, substantially in the form of Exhibit F, appropriately
     completed (individually, as amended, modified, extended, renewed,
     supplemented or replaced from time to time, a "Revolving Credit Note,"
     and, collectively, the "Revolving Credit Notes"), payable to the order
     of such Lender and further evidencing the obligation of the Borrower
     to pay with interest the Aggregate Loans Outstanding of such Lender. 
     Each Lender is hereby authorized to record the date, Type and amount
     of each Revolving Credit Loan made or converted by such Lender, and
     the date and amount of each payment or prepayment of principal
     thereof, and, in the case of Eurodollar Loans, the Interest Period
     with respect thereto, on the schedule annexed to and constituting a
     part of its Revolving Credit Note, and any such recordation shall
     constitute prima facie evidence, absent manifest error, of the
                ----- -----
     accuracy of the information so recorded; provided that no failure of
                                              --------
     any Lender to so record any such information shall relieve the
     Borrower of its obligation to repay any Revolving Credit Loan or
     interest thereon.  Each Revolving Credit Note shall (a) be dated the
     Closing Date, (c) be stated to mature on the Termination Date and (b)
     bear interest on the unpaid principal amount thereof from time to time
     outstanding at the applicable interest rate per annum determined as
     provided in Subsections 2.10 and 2.11.  Interest on each Revolving
     Credit Note shall be payable on the dates specified in
     Subsection 2.10(d).

               2.3  Procedure for Revolving Credit Borrowing.  The Borrower
                    ----------------------------------------
     may borrow under the Revolving Credit Commitments during the
     Commitment Period on any Working Day if the borrowing is a Eurodollar
     Loan or on any Business Day if the borrowing is a Base Rate Loan;
     provided that the Borrower shall give the Agent irrevocable notice,
     --------
     which must be received by the Agent prior to 10:00 A.M., Philadelphia,
     Pennsylvania, time, (a) four (4) Working Days prior to the requested
     Borrowing Date, in the case of Eurodollar Loans, and (b) on the
     requested Borrowing Date, in the case of Base Rate Loans, specifying
     (i) the amount to be borrowed, (ii) the requested Borrowing Date,
     (iii) whether the borrowing is to



















     
<PAGE>

<PAGE>
     

     be a Eurodollar Loan, a Base Rate Loan or a combination thereof, and
     (iv) if the borrowing is to be entirely or partly a Eurodollar Loan,
     the length of the Interest Period for such Eurodollar Loan.  Each
     borrowing of Eurodollar Loans pursuant to the Revolving Credit
     Commitments shall be in an aggregate principal amount of One Million
     Dollars ($1,000,000.00) or a whole multiple of Two Hundred Fifty
     Thousand Dollars ($250,000.00) in excess thereof; provided that no
                                                       --------
     borrowing pursuant to the Revolving Credit Commitments shall exceed an
     amount which is equal to the lesser of (i) the then Available
     Commitments and (ii) the amount, if any, by which (1) the then
     Borrowing Base exceeds (2) the then Aggregate Borrowing Base Charge. 
     Upon receipt of such notice from the Borrower, the Agent shall
     promptly notify each Lender thereof.  Each Lender will make the amount
     of its pro rata share of each borrowing available to the Agent for the
            --- ----
     account of the Borrower at the office of the Agent set forth in
     Subsection 10.2 prior to 11:00 A.M. Philadelphia, Pennsylvania, time
     on the Borrowing Date requested by the Borrower in funds immediately
     available to the Agent, subject to the provisions hereinafter set
     forth in this Subsection.  The proceeds of all Revolving Credit Loans
     will be made available to the Borrower by the Agent at such office of
     the Agent by transfer of such proceeds in immediately available funds
     to a deposit account of the Borrower at First Fidelity designated for
     such purpose, subject to the provisions hereinafter set forth in this
     Subsection.  The Borrower may give the Agent telephonic notices of
     borrowings (to be promptly confirmed by the Borrower in writing if
     requested by the Agent); provided that the Agent shall have the right
                              --------
     at any time to require that all subsequent notices of borrowings be
     made in writing.  The Borrower hereby acknowledges and assumes all
     risks of errors (including errors in speaking, hearing and
     transcription), impersonation, lack of authority, and all other risks
     inherent in telephonic notices of borrowings, and the Borrower agrees
     that none of the Agent, the Lenders and the Issuing Bank, or any of
     their directors, officers, employees or other agents, shall have any
     liability to the Borrower on account of, and no Obligations arising in
     connection with any Revolving Credit Loans made by the Lenders shall
     be affected by, any such risks.  Anything to the contrary in this
     Subsection notwithstanding, the Agent may determine, for
     administrative convenience, to conduct weekly settlements between the
     Agent and the Lenders in order to settle and account for, among
     themselves, Revolving Credit Loans made to the Borrower and payments
     of the Obligations received by the Agent for the account of the
     Lenders; provided, that the Agent shall have the right to require at
              --------
     any time that such settlements be conducted more often or in
     accordance with the preceding provisions of this Subsection. 
     Accordingly, the Agent may, but shall not be required to, fund
     Revolving Credit Loans requested by the Borrower pending receipt by
     the Agent of each Lender's pro rata share thereof.  In the case of
                                --- ----
     such Revolving Credit Loans funded by the Agent, interest thereon
     shall accrue for the account of the Agent until and except to the
     extent that the Agent shall have received the pro rata shares thereof
                                                   --- ----
     of the Lenders.

















     
<PAGE>

<PAGE>
     

               2.4  Fees and Reduction of Commitments.  (a)  The Borrower
                    ---------------------------------
     agrees to pay to the Agent, for the account of each Lender, an unused
     facility fee from and including the first day of the Commitment Period
     to the Termination Date, computed at the rate of one-half of one
     percent (.5%) per annum on the average daily amount of the Available
     Commitment of such Lender during the period for which payment is made,
     payable quarterly on the last day of each March, June, September and
     December and on the Termination Date or such earlier date as the
     Revolving Credit Commitments shall terminate as provided herein,
     commencing on the first of such dates to occur after the date hereof. 


                    (b)  The Borrower shall have the right, upon not less
     than ten (10) Business Days' written notice to the Agent, to reduce
     the amount of the Revolving Credit Commitments, provided that (i) no
                                                     --------
     such reduction shall be permitted if, after giving effect thereto and
     to any prepayments of the Revolving Credit Loans made on the effective
     date thereof, the Aggregate Borrowing Base Charge would exceed the
     amount of the Revolving Credit Commitments then in effect and (ii) the
     Revolving Credit Commitments may be reduced only to the extent that
     the amount thereof exceeds Twenty Million Dollars ($20,000,000.00). 
     Each such reduction shall be in an amount of Two Hundred Fifty
     Thousand Dollars ($250,000.00), or a whole multiple thereof, and shall
     reduce permanently and pro rata the aggregate amount of the Revolving
                            --- ----
     Credit Commitments then in effect.

                    (c)  The Borrower also agrees to pay to the Agent, for
     the account of the Agent, on the first day of each month, a collateral
     monitoring fee equal to Three Thousand Dollars ($3,000.00).

               2.5  Payment at Maturity.  The Borrower shall pay in full on
                    -------------------
     the Termination Date the Aggregate Loans Outstanding of each Lender,
     together with all accrued and unpaid interest thereon.

               2.6  Optional Prepayments.  The Borrower may on the last day
                    --------------------
     of the relevant Interest Period if the Revolving Credit Loans to be
     prepaid are in whole or in part Eurodollar Loans, or at any time and
     from time to time if the Revolving Credit Loans to be prepaid are Base
     Rate Loans, prepay the Revolving Credit Loans, in whole or in part,
     upon at least two (2) Business Days' irrevocable notice to the Agent
     (except in the case of any prepayment of Base Rate Loans resulting
     from application by First Fidelity of funds on deposit from time to
     time in the First Fidelity Cash Collateral Account pursuant to
     Subsection 2.4 of the Borrower Security Agreement), specifying the
     date and amount of prepayment and whether the prepayment is of
     Eurodollar Loans or Base Rate Loans or a combination thereof, and if
     of a combination thereof, the amount of prepayment allocable to each;
     provided that each Compensable Prepayment shall be accompanied by
     --------
     payment of the



















     
<PAGE>

<PAGE>
     

     applicable Prepayment Premium.  Upon receipt of any such prepayment
     notice the Agent shall promptly notify each Lender thereof.  If any
     such prepayment notice is given by the Borrower, the payment amount
     specified in such notice shall be due and payable on the date
     specified therein.  Partial prepayments may only be made if, after
     giving effect thereto, Subsection 2.9 shall not have been contravened.

               2.7  Mandatory Prepayments.  The Borrower shall immediately
                    ---------------------
     prepay the Revolving Credit Loans in an amount equal to any amount by
     which (a) the Aggregate Borrowing Base Charge from time to time
     exceeds (b) the Borrowing Base.

               2.8  Conversion Options; Minimum Amount of Loans.  (a)  The
                    -------------------------------------------
     Borrower may elect from time to time to convert Eurodollar Loans to
     Base Rate Loans by giving the Agent at least three (3) Business Days'
     prior irrevocable notice of such election; provided that any such
                                                --------
     conversion of Eurodollar Loans shall only be made on the last day of
     an Interest Period with respect thereto.  The Borrower may elect from
     time to time to convert Base Rate Loans to Eurodollar Loans by giving
     the Agent at least three (3) Working Days' prior irrevocable notice of
     such election; provided that no Base Rate Loan shall be converted to a
                    --------
     Eurodollar Loan after the day that is one (1) month prior to the
     Termination Date.  Upon receipt of such notice, the Agent shall
     promptly notify each Lender thereof.  All or any part of outstanding
     Eurodollar Loans and Base Rate Loans may be converted as provided
     herein; provided that (i) no Revolving Credit Loan may be converted
             --------
     into a Eurodollar Loan when any Default or Event of Default has
     occurred and is continuing, (ii) partial conversions shall, subject to
     Subsection 2.9, be in an aggregate principal amount of Two Hundred
     Fifty Thousand Dollars ($250,000.00) or a whole multiple thereof, and
     (iii) any such conversion may only be made if, after giving effect
     thereto, Subsection 2.9 shall not have been contravened.

                    (b)  Any Eurodollar Loans may be continued as such upon
     the expiration of an Interest Period with respect thereto by
     compliance by the Borrower with the notice provisions contained in
     Subsection 2.8(a); provided, that no Eurodollar Loan may be continued
                        ---------
     as such when any Default or Event of Default has occurred and is
     continuing, but shall be automatically converted to a Base Rate Loan
     on the last day of the then current Interest Period with respect
     thereto.  The Agent shall notify the Lenders and the Borrower promptly
     that such automatic conversion contemplated by this Subsection 2.8(b)
     will occur.

               2.9  Minimum Amounts of Tranches.  All borrowings,
                    ---------------------------
     conversions, payments, prepayments and selection of' Interest Periods
     hereunder shall be in such amounts and be made pursuant to such
     elections so that, after giving effect thereto, the aggregate



















     
<PAGE>

<PAGE>
     

     principal amount of any Eurodollar Tranche shall not be less than One
     Million Dollars ($1,000,000.00).

               2.10 Interest Rate and Payment Dates.  (a)  The Revolving
                    -------------------------------
     Credit Loans comprising each Eurodollar Tranche shall bear interest
     for each day during each Interest Period with respect thereto on the
     unpaid principal amount thereof at a rate per annum equal to the
     Eurodollar Rate plus the Applicable Margin.

                    (b)  Base Rate Loans shall bear interest for the period
     from and including the Borrowing Date or date of conversion thereof on
     the unpaid principal amount thereof at a rate per annum equal to the
     Base Rate plus the Applicable Margin.

                    (c)  If an Event of Default has occurred and is
     continuing, each Eurodollar Loan shall be converted to a Base Rate
     Loan at the end of the last Interest Period with respect thereto, and
     all Revolving Credit Loans, and any judgment or order of any
     Governmental Authority entered for payment of all or any part thereof
     or other amounts bearing interest under this Agreement, shall, at the
     Agent's election, bear interest at a rate per annum which is three
     percent (3%) above the rate which would otherwise be applicable
     pursuant to Subsection 2.10(a) or (b).

                    (d)  Interest shall be payable in arrears on each
     Interest Payment Date.

               2.11 Computation of Interest and Fees.  (a)  Unused facility
                    --------------------------------
     fees and interest in respect of the Revolving Credit Loans shall be
     calculated on the basis of a 360 day year for the actual days elapsed
     (including the first but excluding the last day of the relevant
     period).  The Agent shall as soon as practicable notify the Borrower
     and the Lenders of each determination of a Eurodollar Rate.  Any
     change in the interest rate on Revolving Credit Loans resulting from a
     change in the Base Rate or the Eurocurrency Reserve Requirements shall
     become effective as of the opening of business on the day on which
     such change in the Base Rate is announced, or such change in the
     Eurocurrency Reserve Requirements shall become effective, as the case
     may be.  The Agent shall as soon as practicable notify the Borrower
     and the Lenders of the effective date and the amount of each such
     change.

                    (b)  Each determination of an interest rate by the
     Agent pursuant to any provision of this Agreement shall be conclusive
     and binding on the Borrower and the Lenders in the absence of manifest
     error.  The Agent shall, at the request of the Borrower, deliver to
     the Borrower a statement showing the quotations used by the Agent in
     determining any interest rate pursuant to Subsection 2.10(a).
























     
<PAGE>

<PAGE>
     

               2.12 Inability to Determine Interest Rate.  In the event
                    ------------------------------------
     that:

                    (a)  the Agent shall have determined (which
          determination shall be conclusive and binding upon the Borrower)
          that, by reason of circumstances affecting the interbank
          eurodollar market, adequate and reasonable means do not exist for
          ascertaining the Eurodollar Rate for any requested Interest
          Period; or

                    (b)  the Agent shall have received notice prior to the
          first day of such Interest Period from any Lender that the
          interest rate determined pursuant to Subsection 2.10(a) for such
          Interest Period does not accurately reflect the cost to such
          Lender (as conclusively certified to the Borrower by such Lender
          in a writing setting forth in reasonable detail the facts giving
          rise to such determination) of making or maintaining such
          Lender's affected Eurodollar Loans during such Interest Period,

     with respect to (a) proposed Revolving Credit Loans that the Borrower
     has requested be made as Eurodollar Loans, (b) Eurodollar Loans that
     will result from the requested conversion of Base Rate Loans into
     Eurodollar Loans or (c) the continuation of Eurodollar Loans beyond
     the expiration of the then current Interest Period with respect
     thereto, the Agent shall forthwith give telecopy or telephonic notice
     of such determination to the Borrower and the Lenders at least one (1)
     day prior to, as the case may be, the requested Borrowing Date for
     such Eurodollar Loans, the conversion date of such Base Rate Loans or
     the last day of such Interest Period.  If such notice is given, unless
     the Borrower withdraws its notice of borrowing, conversion or
     continuation, (i) any requested Eurodollar Loans shall be made as Base
     Rate Loans, (ii) any Base Rate Loans that were to have been converted
     to Eurodollar Loans shall be continued as Base Rate Loans and
     (iii) any outstanding Eurodollar Loans shall be converted, on the last
     day of the then current Interest Period with respect thereto, to Base
     Rate Loans.  Until such notice has been withdrawn by the Agent, no
     further Eurodollar Loans shall be made, nor shall the Borrower have
     the right to convert Base Rate Loans to Eurodollar Loans.

               2.13 Pro Rata Treatment and Payments.  (a)  Each borrowing
                    -------------------------------
     by the Borrower from the Lenders, each purchase by a Lender of a
     participation in a Letter of Credit or an Indemnified Letter of
     Credit, each payment by the Borrower on account of any unused facility
     fees hereunder and any reduction of the Revolving Credit Commitments
     of the Lenders hereunder shall be made pro rata according to the
                                            --- ----
     respective Commitment Percentages of the Lenders.  Each payment
     (including each prepayment) by the Borrower on account of principal of
     and interest on the Revolving Credit Loans shall be made pro rata
                                                              --- ----
      according to the respective Aggregate Loans Outstanding of each
     Lender.  All payments (including prepayments) to be made by the
     Borrower under this Agreement, the Notes or any



















     
<PAGE>

<PAGE>
     

     other Credit Document, for the account of the Lenders, whether on
     account of principal, interest, fees, expenses or other amounts, shall
     be made without deduction, setoff or counterclaim and shall be made to
     the Agent, for the account of the Lenders, at the Agent's office set
     forth in Subsection 10.2, in lawful money of the United States of
     America and in immediately available funds.  The Agent shall
     distribute such payments to the Lenders promptly upon receipt in like
     funds as received.  If any payment hereunder (other than payments on
     the Eurodollar Loans) becomes due and payable on a day other than a
     Business Day, such payment shall be extended to the next succeeding
     Business Day, and, with respect to payments of principal, interest
     thereon shall be payable at the then applicable rate during such
     extension.  If any payment on a Eurodollar Loan becomes due and
     payable on a day other than a Working Day, the maturity thereof shall
     be extended to the next succeeding Working Day unless the result of
     such extension would be to extend such payment into another calendar
     month, in which event such payment shall be made on the immediately
     preceding Working Day.

                    (b)  Unless the Agent shall have been notified in
     writing by any Lender prior to a Borrowing Date that such Lender will
     not make the amount which would constitute its Commitment Percentage
     of the borrowing on such date available to the Agent, the Agent may
     assume that such Lender will make such amount available to the Agent,
     and the Agent may, in reliance upon such assumption, make available to
     the Borrower a corresponding amount.  If such amount is made available
     to the Agent on a date after such amount is due to the Agent, whether
     at a periodic settlement or on such Borrowing Date in accordance with
     Subsection 2.3, such Lender shall pay to the Agent on demand interest
     on such amount during the period from and including the date such
     amount is due to but not including the date on which such Lender makes
     such amount immediately available to the Agent at the rate specified
     in Subsection 2.13(c).  A certificate of the Agent submitted to any
     Lender with respect to any amounts owing under this Subsection 2.13(b)
     shall be conclusive, absent manifest error.  If such Lender's
     Commitment Percentage of such borrowing is not in fact made available
     to the Agent by such Lender within three (3) Business Days of such
     date, the Agent shall be entitled to recover such amount from the
     Borrower on demand, with interest thereon at the rate per annum
     applicable to Base Rate Loans hereunder.  The Borrower agrees that the
     obligations of the Lenders under this Agreement, including, without
     limitation, their obligations to make Revolving Credit Loans and to
     fund participations in Letters of Credit and Indemnified Letters of
     Credit, are several, and that no Lender shall be liable for the
     performance or nonperformance of the obligations of any other Lender
     under this Agreement or any other Credit Document.

                    (c)  In the event that any Lender shall fail to pay to
     the Agent any amount payable by such Lender to the Agent under the
     terms of this Agreement and with
























     
<PAGE>

<PAGE>
     

     respect to which this Agreement does not otherwise provide for the
     payment of interest by such Lender to the Agent, or in the event that
     the Agent shall fail to pay to any Lender any amount due to such
     Lender from the Agent under the terms of this Agreement and with
     respect to which this Agreement does not otherwise provide for the
     payment of interest by the Agent to such Lender, then such Lender
     shall pay to the Agent on demand, or the Agent shall pay to such
     Lender on demand, as the case may be, interest on such amount during
     the period from and including the day such payment was due to but not
     including the day such payment is made in immediately available funds,
     equal to the product of (i) the Federal Funds Rate, (ii) the amount of
     such payment and (iii) a fraction, the numerator of which is the
     number of days during such period and the denominator of which is 360.

               2.14 Illegality.  Notwithstanding any other provisions
                    ----------
     herein, if any Requirement of Law or any change therein or in the
     interpretation or application thereof shall in the opinion of counsel
     to any Lender (which may include in-house counsel) make it unlawful
     for such Lender to make or maintain Eurodollar Loans as contemplated
     by this Agreement, (a) the Revolving Credit Commitment of such Lender
     hereunder to make Eurodollar Loans or convert Base Rate Loans to
     Eurodollar Loans shall forthwith be canceled and (b) such Lender's
     Revolving Credit Loans then outstanding as Eurodollar Loans, if any,
     shall be converted automatically to Base Rate Loans on the respective
     last days of the then current Interest Periods for such Eurodollar
     Loans or within such earlier period as required by law.  The Agent
     agrees to notify the Borrower in writing of any such conversion of
     Eurodollar Loans to Base Rate Loans, provided that the Agent shall
                                          --------
     have no liability to the Borrower or any other Person on account of
     any failure of the Agent to so give such written notification to the
     Borrower, and no failure of the Agent to so give such written
     notification to the Borrower shall impair, limit, diminish or in any
     way affect any of the Obligations or any rights, interests or remedies
     of the Agent, any Lender or Issuing Bank.  If any such conversion of a
     Eurodollar Loan occurs on a day which is not the last day of the
     current Interest Period with respect thereto, the Borrower shall pay
     to such Lender, within ten (10) days after demand by such Lender, such
     amounts, if any, as may be required pursuant to Subsection 2.17.

               2.15 Requirements of Law.  (a)  In the event that any
                    -------------------
     Requirement of Law or any change therein or in the interpretation or
     application thereof or compliance by any Lender with any request or
     directive (whether or not having the force of law) from any central
     bank or other Governmental Authority arising from and after the
     Closing Date:

                    (i)  does or shall subject any Lender to any additional
          tax of any kind whatsoever with respect to this Agreement, any
          Note or any Eurodollar Loans made by it, or change the basis of
          taxation of payments to such Lender of principal,





















     
<PAGE>

<PAGE>
     

          fees, interest or any other amount payable hereunder (except for
          changes in the rate of tax on the overall net income of such
          Lender);

                   (ii)  does or shall impose, modify or hold applicable
          any reserve, special deposit, assessment, capital adequacy,
          compulsory loan or similar requirement against assets held by, or
          deposits or other liabilities in or for the account of, advances
          or loans by, or other credit extended by, or any other
          acquisition of funds by, any office of such Lender; or

                  (iii)  does or shall impose on such Lender any other
          condition;

     and the result of any of the foregoing is to increase the cost to such
     Lender, by any amount which such Lender deems to be material, of
     making, renewing or maintaining advances or extensions of credit or to
     reduce any amount receivable hereunder, then, in any such case, the
     Borrower shall pay such Lender, within ten (10) days after demand by
     such Lender, any additional amounts necessary to compensate such
     Lender for such additional cost or reduced amount receivable, together
     with interest on such additional amounts from the date demand is made
     until payment in full thereof at the rate that would be applicable to
     Base Rate Loans.  If a Lender becomes entitled to claim any additional
     amounts pursuant to this Subsection, it shall promptly notify the
     Borrower, through the Agent, of the event by reason of which it has
     become so entitled.  A certificate as to any additional amounts
     payable pursuant to the foregoing sentence submitted by such Lender,
     through the Agent, to the Borrower shall show the means by which such
     additional amounts have been calculated and shall be conclusive in the
     absence of manifest error.  This covenant shall survive the
     termination of this Agreement and payment of the outstanding Notes for
     a period of one (1) year with respect to amounts for which written
     notice has been received by the Borrower prior to payment of the
     outstanding Notes.

                    (b)  In the event that any Lender shall have determined
     that the adoption from and after the Closing Date of any law, rule,
     regulation or guideline regarding capital adequacy, or any change from
     and after the Closing Date therein or in the interpretation or
     application thereof or compliance by any Lender or any corporation
     controlling such Lender with any request or directive regarding
     capital adequacy (whether or not having the force of law) from any
     central bank or Governmental Authority, including, without limitation,
     the issuance of any final rule, regulation or guideline, does or shall
     have the effect of reducing the rate of return on such Lender's or
     such corporation's capital as a consequence of its obligations
     hereunder to a level below that which such Lender or such corporation
     could have achieved but for such adoption, change or compliance
     (taking into consideration such Lender's or such corporation's
     policies with respect to capital adequacy)























     
<PAGE>

<PAGE>
     

     by an amount deemed by such Lender to be material, then from time to
     time, after submission by such Lender to the Borrower (with a copy to
     the Agent) of a written request therefor showing the means by which
     such additional amounts have been calculated and stating in reasonable
     detail the reasons therefor, the Borrower shall pay to such Lender
     such additional amount or amounts as will compensate such Lender for
     such reduction.

               2.16 Taxes.  (a)  All payments made by the Borrower under
                    -----
     this Agreement shall be made free and clear of, and without reduction
     or withholding for or on account of, any present or future income,
     stamp or other taxes, levies, imposts, duties, charges, fees,
     deductions or withholdings, now or hereafter imposed, levied,
     collected, withheld or assessed by any Governmental Authority
     excluding, in the case of the Agent, the Issuing Bank and each Lender,
     net income and franchise taxes imposed on the Agent, the Issuing Bank
     or such Lender by the jurisdiction under the laws of which the Agent,
     the Issuing Bank or such Lender is organized or any political
     subdivision or taxing authority thereof or therein, or by any
     jurisdiction in which the Agent's, the Issuing Bank's or such Lender's
     Domestic Lending Office or Eurodollar Lending Office, as the case may
     be, is located or any political subdivision or taxing authority
     thereof or therein, and excluding in the case of any Lender that is
     not incorporated under the laws of the United States of America or a
     state thereof, any tax imposed as a result of the failure of such
     Lender to deliver the United States Internal Revenue Service Forms
     required by Subsection 2.16(b) (all such non-excluded taxes, levies,
     imposts, deductions, charges or withholdings being hereinafter called
     "Taxes").  If any Taxes are required to be withheld from any amounts
     payable to the Agent, the Issuing Bank or any Lender hereunder, under
     the Notes or under any other Credit Document, the amounts so payable
     to the Agent, the Issuing Bank or such Lender shall be increased to
     the extent necessary to yield to the Agent, the Issuing Bank or such
     Lender (after payment of all Taxes, including those payable on
     additional amounts paid pursuant to this Subsection 2.16(a)) interest
     or other amounts payable hereunder at the rates or in the amounts
     specified in this Agreement, the Notes or any other Credit Document. 
     Whenever any Taxes are payable by the Borrower, as promptly as
     possible thereafter, the Borrower shall send to the Agent for its own
     account or for the account of the Issuing Bank or such Lender, as the
     case may be, a certified copy of an original official receipt received
     by the Borrower showing payment thereof.  If the Borrower fails to pay
     any Taxes when due to the appropriate taxing authority or fails to
     remit to the Agent the required receipts or other required documentary
     evidence, the Borrower shall indemnify the Agent, the Issuing Bank and
     the Lenders for any incremental taxes, interest or penalties that may
     become payable by the Agent, the Issuing Bank or any Lender as a
     result of any such failure.

                    (b)  Prior to the first Interest Payment Date, each
     Lender that is not incorporated under the laws of the United States of
     America or a state thereof agrees that it





















     
<PAGE>

<PAGE>
     

     will deliver to the Borrower and the Agent (i) two duly completed
     copies of United States Internal Revenue Service Form 1001 or 4224 or
     successor applicable form, as the case may be, certifying in each case
     that such Lender is entitled to receive payments under this Agreement,
     the Notes and the other Credit Documents without deduction or
     withholding of any United States federal income taxes, and (ii) a
     United States Internal Revenue Service Form W-8 or W-9 or successor
     applicable form, as the case may be, to establish an exemption from
     United States backup withholding tax.  Each Lender which delivers to
     the Borrower and the Agent a Form 1001 or 4224 and Form W-8 or W-9, or
     successor applicable forms, pursuant to the next preceding sentence
     further undertakes to deliver to the Borrower and the Agent two
     further copies of the said Form 1001 or 4224 and Form W-8 or W-9, or
     successor applicable forms, or other manner of certification, as the
     case may be, on or before the date that any such form expires or
     becomes obsolete or after the occurrence of any event requiring a
     change in the most recent form previously delivered by it to the Agent
     and the Borrower, and such extensions or renewals thereof as may
     reasonably be requested by the Agent or the Borrower, certifying in
     the case of a Form 1001 or 4224 that such Lender is entitled to
     receive payments under this Agreement, the Notes and the other other
     Credit Documents without deduction or withholding of any United States
     federal income taxes, unless in any such cases an event (including,
     without limitation, any change in treaty, law or regulation) has
     occurred after the date of this Agreement and prior to the date on
     which any such delivery would otherwise be required which renders all
     such forms inapplicable or which would prevent such Lender from duly
     completing and delivering any such form with respect to it and such
     Lender advises the Agent and the Borrower that it is not capable of
     receiving payments without any deduction or withholding of United
     States federal income tax, and in the case of a Form W-8 or W-9,
     establishing an exemption from United States backup withholding tax.

                    (c)  The agreements in Subsection 2.16(a) shall survive
     the termination of this Agreement and the payment of the Notes and all
     other amounts payable hereunder and under the other Credit Documents
     for a period of one (1) year.

               2.17 Indemnity.  The Borrower agrees to indemnify each
                    ---------
     Lender and to hold each Lender harmless from any loss or expense which
     such Lender may sustain or incur as a consequence of (a) default by
     the Borrower in payment when due of the principal amount of or
     interest on any Eurodollar Loans of such Lender, (b) default by the
     Borrower in making a borrowing or conversion after the Borrower has
     given a notice of borrowing in accordance with Subsection 2.6 or a
     notice of conversion pursuant to Subsection 2.8, except in accordance
     with Subsection 2.12, (c) default by the Borrower in making any
     prepayment after the Borrower has given a notice in accordance with
     Subsection 2.6, or (d) the making of a prepayment of a Eurodollar Loan
     on a day which is not the last day of an Interest Period























     
<PAGE>

<PAGE>
     

     with respect thereto, including, without limitation, in each case, any
     such loss or expense arising from the reemployment of funds obtained
     by it to maintain its Eurodollar Loans hereunder or from fees payable
     to terminate the deposits from which such funds were obtained.  This
     covenant shall survive termination of this Agreement and payment of
     the outstanding Notes and all other amounts payable hereunder and
     under the other Credit Documents for a period of one (1) year.

               2.18 Certain Calculations.  Calculations of all amounts
                    --------------------
     payable to the Lenders and other determinations under
     Subsections 2.12, 2.14, 2.15 and 2.17 shall be made as though each of
     the Lenders had actually funded each of its relevant Eurodollar Loans
     either (i) by obtaining a Eurodollar deposit bearing interest at the
     rate such Lender would have offered to first-class banks in the
     interbank market selected by such Lender for Dollar deposits in same
     day funds in an amount equal to the amount of such Eurodollar Loan and
     having a maturity comparable to the relevant Interest Period or
     (ii) through the transfer of such a Eurodollar deposit from an
     offshore office of such Lender to a domestic office of such Lender in
     the United States of America; provided, that each of the Lenders
                                   --------
     reserves the right to fund each of its Eurodollar Loans in any manner
     it sees fit and the foregoing assumptions shall be utilized only for
     the purposes of calculating amounts payable and making other
     determinations pursuant to said Subsections.


               SECTION 3.  LETTERS OF CREDIT

               3.1  Letter of Credit Commitment.  Subject to the terms and
                    ---------------------------
     conditions hereof, the Issuing Bank, on behalf of the Lenders, and in
     reliance on the agreements of the Lenders set forth in Subsection 3.3,
     agrees to issue for the account of the Borrower commercial and standby
     letters of credit for such purposes, in such amounts, for the benefit
     of such Persons and subject to such terms and conditions as may be
     acceptable to the Issuing Bank and the Required Lenders in their
     discretion exercised in good faith (individually, as amended,
     modified, extended, renewed, supplemented or replaced from time to
     time, a "Letter of Credit," and, collectively, the "Letters of
     Credit"), from and including the date of this Agreement to but not
     including the date which is thirty (30) days prior to the Termination
     Date (the "L/C Commitment"); provided that the L/C Exposure shall not
                                  --------
     exceed the lesser of (a) the L/C Maximum Exposure and (b) the excess,
     if any, of the Revolving Credit Commitments over the Aggregate Loans
     Outstanding of all Lenders; provided further that the Standby L/C
                                 -------- -------
     Exposure shall not exceed the Standby L/C Maximum Exposure; provided
                                                                 --------
     further that the Commercial L/C Exposure shall not exceed the
     -------
     Commercial L/C Maximum Exposure; provided further that at no time
                                      -------- -------
     shall the Aggregate Borrowing Base Charge exceed the Borrowing Base;
     and provided further that no Letter of Credit (including
         -------- -------
















     
<PAGE>

<PAGE>
     

     any renewal or extension thereof, whether or not automatic) shall have
     an expiry date which is later than the date which is thirty (30) days
     prior to the Termination Date.

               3.2  L/C Participations.  The Issuing Bank irrevocably
                    ------------------
     grants, and in order to induce the Issuing Bank to issue its Letters
     of Credit hereunder and to execute and deliver the Issuing Bank L/C
     Indemnification Agreement, each Lender irrevocably accepts and hereby
     purchases from the Issuing Bank, on the terms and conditions
     hereinafter stated, for its own account and risk an undivided interest
     equal to such Lender's Commitment Percentage in (a) the Issuing Bank's
     obligations and rights under each Letter of Credit issued hereunder
     and the amount of each drawing paid by the Issuing Bank thereunder and
     (b) the Issuing Bank's obligations with respect to each Indemnified
     Letter of Credit and the amount of each drawing paid by Signet
     Bank/Maryland thereunder.  The Issuing Bank shall notify the Agent and
     each Lender as promptly as possible of the date and amount of each
     drawing under a Letter of Credit and of the date and amount of each
     payment by the Issuing Bank under the Issuing Bank L/C Indemnification
     Agreement.  Each Lender unconditionally and irrevocably agrees with
     the Issuing Bank that it will pay to the Issuing Bank on demand its
     Commitment Percentage of each drawing paid under a Letter of Credit
     and each payment made by the Issuing Bank under the Issuing Bank L/C
     Indemnification Agreement for which the Issuing Bank is not reimbursed
     by the Borrower.  Any such demand may be oral if promptly confirmed in
     writing (including telecopy transmission).  If any Lender fails to
     make any such payment to the Issuing Bank after such Lender receives
     demand as provided above, then such Lender shall pay to the Issuing
     Bank on demand interest on such Lender's obligation to make such
     payment during the period from and including the day on which demand
     for such payment was made by the Issuing Bank to but not including the
     day such Lender makes such payment (or if earlier, the date on which
     the Borrower reimburses the Issuing Bank for such drawing or payment)
     at the rate specified in Subsection 2.13(c).

               3.3  Repayment of Participants.  Upon and only upon receipt
                    -------------------------
     by the Issuing Bank of funds (a) in full or partial reimbursement of
     any drawing paid under a Letter of Credit or of any payment made by
     the Issuing Bank under the Issuing Bank L/C Indemnification Agreement
     with respect to which any Lender has theretofor paid the Issuing Bank
     in full for such Lender's participation pursuant to Subsection 3.2,
     (b) in full or partial payment of interest on any such drawing or
     payment, or (c) arising from the realization of any collateral
     security for the L/C Reimbursement Obligations of the Borrower with
     respect to such drawing or payment, the Issuing Bank will pay to such
     Lender, in the same funds as those received by the Issuing Bank, such
     Lender's Commitment Percentage of such funds.

               3.4  Role of the Issuing Bank.  The Issuing Bank will
                    ------------------------
     exercise and give the same care and attention to each Letter of Credit
     as it gives to its other letters of credit and




















     
<PAGE>

<PAGE>
     

     similar obligations, and the Issuing Bank's sole liability to each
     Lender shall be to distribute promptly to such Lender, as and when
     received by the Issuing Bank, as stated in Subsection 3.3, such
     Lender's Commitment Percentage of any payments received by the Issuing
     Bank and described in Subsection 3.3.  Each Lender agrees that, in
     paying any drawing under a Letter of Credit or making any payment
     under the Issuing Bank L/C Indemnification Agreement, the Issuing Bank
     shall not have any responsibility to obtain any document (other than
     as required by any Letter of Credit) or to ascertain or inquire as to
     the validity or accuracy of any such document or the authority of any
     Person delivering any such document.  Neither the Issuing Bank nor any
     of its representatives, officers, employees or agents shall be liable
     to any Lender for (a) any action taken or omitted to be taken in
     connection herewith at the request or with the approval of the
     Required Lenders or all the Lenders, as required by the terms of this
     Agreement, (b) any action taken or omitted to be taken in the absence
     of gross negligence or willful misconduct, (c) any recitals,
     statements, representations or warranties contained in any document
     distributed to any Lender, (d) the creditworthiness of the Borrower or
     (e) the execution, effectiveness, genuineness, validity or
     enforceability of this Agreement, any Letter of Credit, any L/C
     Agreement or any other document contemplated hereby or thereby.  The
     Issuing Bank shall not incur any liability (i) by acting in reliance
     upon any notice (including any notice from the Agent or any Lender
     that a Default or an Event of Default has occurred or is continuing),
     consent, certificate, statement or other writing (which may be a bank
     wire, telex or similar writing) believed by it to be genuine or to be
     signed by the proper party or parties or (ii) by acting as permitted
     under Subsection 3.13.

               3.5  Lenders' Obligations Absolute.  Each Lender
                    -----------------------------
     acknowledges that its obligations to the Issuing Bank under this
     Section 3, including the obligation to purchase and fund a
     participation in the obligations and rights of the Issuing Bank under
     each Letter of Credit, any unreimbursed drawing under any Letter of
     Credit and the Issuing Bank L/C Indemnification Agreement, is absolute
     and unconditional and shall not be affected by any circumstance
     whatsoever, including, without limitation, (i) the occurrence and
     continuance of a Default or Event of Default, (ii) the fact that a
     condition precedent to the issuance of any Letter of Credit was not in
     fact satisfied, (iii) any failure or inability of any other Lender to
     purchase or fund such a participation hereunder or (iv) any other
     failure by any other Lender to fulfill its obligations hereunder. 
     Each payment by each Lender to the Issuing Bank for its own account or
     to the Agent for the account of the Issuing Bank shall be made,
     without any offset, abatement, withholding or reduction whatsoever. 
     Without affecting the rights and remedies of the Issuing Bank, the
     Agent and the Lenders with respect to the Borrower in the event any
     such condition precedent is not in fact satisfied, each Lender
     authorizes the Agent in its sole discretion and on behalf of such
     Lender (but without obligating the Issuing Bank), without notice to
     such Lender, to waive any condition precedent set forth in Section 5
     to the




















     
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<PAGE>
     

     issuance of the Letter of Credit (or deem each such condition
     precedent satisfied) in connection with each issuance of the Letters
     of Credit unless the Issuing Bank shall have received by the close of
     its business, Philadelphia, Pennsylvania, time, on the Business Day
     immediately preceding the day of such issuance written instructions
     from any Lender not to waive such condition precedent and such written
     instructions have not been withdrawn by such Lender.

               3.6  Reinstatement and Survival.  Notwithstanding anything
                    --------------------------
     herein to the contrary, if the Issuing Bank is required at any time,
     whether before or after the Termination Date, to make any payment
     under the Issuing Bank L/C Indemnification Agreement or under a Letter
     of Credit which was outstanding on or before the Termination Date,
     each Lender shall pay over to the Issuing Bank, in accordance with the
     provisions of this Section, the amount of such Lender's Commitment
     Percentage of such amount.  If any payment made by the Borrower or any
     Other Obligor to the Issuing Bank is rescinded or recovered from or
     restored or returned by the Issuing Bank under authority of any law,
     rule, regulation, order of court or other Governmental Authority, or
     in connection with any compromise or settlement relating thereto or
     relating to pending or threatened action, suit or proceeding relating
     thereto, whether arising out of any proceedings under the United
     States Bankruptcy Code or otherwise, whether before or after the
     Termination Date, each Lender shall, on demand of the Issuing Bank,
     forthwith pay over to the Issuing Bank such Lender's Commitment
     Percentage of such amount.

               3.7  Procedure for Issuance and Renewal of Letters of
                    ------------------------------------------------
     Credit.  (a)  The Borrower may request the Issuing Bank to issue a
     ------
     Letter of Credit by delivering to the Issuing Bank at its office
     specified in Subsection 10.3, and to the Agent at its office specified
     in Subsection 12.2 a copy of (i) such L/C Agreements as may be
     required by the Issuing Bank, completed to the satisfaction of the
     Issuing Bank, including an L/C Application signed by the Borrower and
     a written approval thereof by the Agent, (ii) the proposed form of
     such Letter of Credit (which shall comply with the applicable
     requirements set forth herein) and (iii) such other certificates,
     documents and other papers and information as the Issuing Bank may
     reasonably request.  Within three (3) Business Days following the
     latest to occur of (i) the date on which the Issuing Bank shall have
     received such documents and other papers and information and (ii) the
     satisfaction of all other conditions to the issuance thereof, then,
     unless the Required Lenders shall have notified the Issuing Bank that
     the purpose, amount or terms and conditions of such Letter of Credit
     are not acceptable to the Required Lenders or that a condition
     precedent to the issuance thereof has not been satisfied, the Issuing
     Bank shall issue such Letter of Credit (if the Borrower shall have
     requested that such Letter of Credit be issued immediately) or (if the
     Borrower shall have requested in the related L/C Application that such
     Letter of Credit be issued at a later date) the Issuing Bank shall
     notify




















     
<PAGE>

<PAGE>
     

     the Borrower that the Issuing Bank shall issue such Letter of Credit
     on such later date or that the Issuing Bank shall not issue such
     Letter of Credit by reason of a provision set forth herein. 
     Notwithstanding any approval by the Agent or any Lender and without
     further approval by the Agent or such Lender, and without in any way
     affecting any obligations of such Lender under Subsections 3.2 and
     3.6, the Issuing Bank may make or agree to any changes in the terms of
     the Letter of Credit, other than the amount thereof or the expiry date
     applicable thereto.  Promptly following issuance of each Letter of
     Credit by the Issuing Bank, the Issuing Bank shall provide to the
     Agent copies thereof and of the related L/C Agreements, certificates,
     documents and papers.  Upon each receipt by the Agent of copies of
     Letters of Credit, L/C Agreements and other certificates, documents
     and papers relating to a Letter of Credit as described in this
     Subsection, the Agent shall promptly provide copies thereof to each
     Lender.

                    (b)  The Borrower may request the extension or renewal
     of a Letter of Credit issued hereunder by giving written notice to the
     Issuing Bank, and a copy thereof to the Agent, at least three (3)
     Business Days prior to the then current expiry date of such Letter of
     Credit (provided that the Issuing Bank may accommodate notices on
     shorter notice in its sole discretion).  If no Default or Event of
     Default has occurred and all conditions set forth in this Agreement to
     the renewal or extension of such Letter of Credit shall have been
     satisfied, the Issuing Bank shall promptly issue such extension or
     renewal and shall furnish the Agent and each Lender with a copy of
     such extended or renewed Letter of Credit.

                    (c)  Notwithstanding anything to the contrary in this
     Agreement, on and after the Termination Date, the Issuing Bank shall
     have no obligation to extend or renew any Letter of Credit issued
     hereunder, and each Lender shall have no obligation to purchase a
     participation in the Issuing Bank's obligations and rights under any
     Letter of Credit extended or renewed on or after the Termination Date.

               3.8  Reimbursement of the Issuing Bank.  In the case of each
                    ---------------------------------
     drawing paid under any Letter of Credit and each payment made by the
     Issuing Bank under the Issuing Bank L/C Indemnification Agreement, the
     Issuing Bank shall promptly notify the Borrower, the Agent and each
     Lender of such drawing or payment and of the amount thereof, and the
     Borrower (i) shall reimburse the Issuing Bank for the amount of such
     drawing or payment not later than the close of business on the first
     Business Day following the day on which the Borrower received notice
     of such drawing or payment, and (ii) shall pay (A) all charges and
     expenses relating to such drawing or payment as may be payable in
     accordance with Subsection 3.9 or applicable L/C Agreements and (B)
     interest at the rate specified in Subsection 3.10 on the amount of
     such drawing or payment for the period commencing on and including the
     date of payment of such drawing or payment and ending on and including























     
<PAGE>

<PAGE>
     

     the date the Borrower reimburses the Issuing Bank for such drawing or
     payment.  The Borrower shall pay the Issuing Bank in Dollars for any
     such drawing or payment drawn or paid in Dollars.  In the case of any
     such drawing or payment drawn or paid in a currency other than
     Dollars, the Borrower shall pay the Issuing Bank the equivalent amount
     of such drawing or payment in immediately available funds in Dollars
     at the Issuing Bank's selling rate of exchange (or, if applicable, its
     correspondent's selling rate of exchange) for cable transfers to the
     place where the Issuing Bank pays such drawing or makes such payment. 
     Notwithstanding any other provision of this Agreement, the payment by
     the Issuing Bank of each drawing under a Letter of Credit and each
     amount due to Signet Bank/Maryland under the Issuing Bank L/C
     Indemnification Agreement shall be deemed to constitute an irrevocable
     notice of borrowing by the Borrower under Subsection 2.3 and, at any
     time after such request, the Agent is irrevocably authorized by the
     Borrower and the Lenders to, and the Agent may, for the account of the
     Lenders and unless directed otherwise by the Required Lenders, make
     Revolving Credit Loans constituting Base Rate Loans to the Borrower in
     an amount equal to the amount of such payment and any charges,
     expenses or interest referred to in clauses (A) and (B) of this
     Subsection, notwithstanding any limitations set forth in
     Subsection 2.3, and transfer the proceeds of such Revolving Credit
     Loans to the Issuing Bank in payment of the Borrower's L/C
     Reimbursement Obligations and other obligations in connection with
     such payment.  If an Event of Default has occurred and is continuing,
     the Borrower agrees to pledge to the Issuing Bank and grant to the
     Issuing Bank a security interest in cash, cash equivalents or other
     liquid assets acceptable to the Issuing Bank in its discretion
     exercised in good faith as security for the amount of the L/C Exposure
     from time to time.

               3.9  Commissions, Fees and Charges.  (a)  In the case of
                    -----------------------------
     each issuance, renewal or extension of any commercial Letter of
     Credit, the Borrower agrees to pay to the Agent, for the account of
     each Lender ratably according to its Commitment Percentage of the face
     amount of such Letter of Credit, a negotiation fee equal to the
     product of (i) the Commercial L/C Negotiation Fee Rate and (ii) the
     face amount of such Letter of Credit.

                    (b)  In the case of each issuance, renewal or extension
     of any standby Letter of Credit, the Borrower agrees to pay (i) to the
     Issuing Bank, a set-up charge equal to One Hundred Twenty-Five Dollars
     ($125.00), and (ii) to the Agent, for the account of each Lender
     ratably according to its Commitment Percentage of the face amount of
     such Letter of Credit, a commission on the face amount of such Letter
     of Credit calculated at the Standby L/C Commission Rate, based upon a
     year of 360 days and payable for the actual number of days in the
     original term, the renewal term or the extended term of such Letter of
     Credit.
























     
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<PAGE>
     

                    (c)  Payment of the fees set forth in this Subsection
     shall be a condition to the issuance of each Letter of Credit;
     provided that, in the case of any automatic renewal or automatic
     --------
     extension of any Letter of Credit in accordance with the terms
     thereof, such fees shall be paid by the Borrower prior to the date of
     such automatic renewal or automatic extension.

                    (d)  In addition to the fees referred to in
     Subsections 3.9(a) and (b), the Borrower agrees to pay or reimburse
     the Issuing Bank for such normal and customary fees, costs and
     expenses as are incurred or charged by the Issuing Bank or any
     correspondents of the Issuing Bank in issuing, effecting payment
     under, maintaining or administering any Letter of Credit (including,
     without limitation, amendment fees, correspondent bank fees,
     reissuance costs and cancellation fees) upon notice and invoice of
     such costs and expenses.

                    (e)  The Agent shall promptly distribute to each Lender
     all letter of credit fees and commissions received by the Agent for
     the account of such Lender.

               3.10 Interest on Amounts Disbursed under Letters of Credit. 
                    -----------------------------------------------------
     The Borrower agrees to pay to the Issuing Bank interest on any and all
     amounts drawn under any Letter of Credit or paid under the Issuing
     Bank L/C Indemnification Agreement until reimbursed in full at a
     fluctuating rate per annum equal to the rate that would be applicable
     to Base Rate Loans.  Interest accrued hereunder shall be payable on
     demand.  For the purposes of computing the number of days for which
     interest shall accrue on amounts disbursed under Letters of Credit,
     payments received by the Issuing Bank after 1:00 P.M., Philadelphia,
     Pennsylvania, time shall be deemed to have been received on the next
     following Business Day.  All payments by the Borrower to the Issuing
     Bank shall be made in lawful currency of the United States and in
     immediately available funds without setoff or counterclaim to the
     Issuing Bank at its office specified in Subsection 10.3.

               3.11 Computation of Interest and Fees; Payment not on
                    ------------------------------------------------
     Business Days.  (a)  Any change in any interest rate under this
     -------------
     Section 3 resulting from a change in the Base Rate shall become
     effective as of the opening of business on the day on which such
     change in the Base Rate becomes effective.

                    (b)  If any payment under this Section 3 becomes due
     and payable on a day which is not a Business Day, the maturity thereof
     shall be extended to the next succeeding Business Day, and, in the
     case of any amount drawn under a Letter of Credit or paid under the
     Issuing Bank L/C Indemnification Agreement, interest thereon shall be
     payable at the then applicable rate during such extension.






















     
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               3.12 Increased Costs.  If any law or regulation or any
                    ---------------
     change in the interpretation or application thereof by any
     Governmental Authority charged with the administration thereof shall
     either (a) impose, modify, assess or deem applicable any reserve,
     special deposit, assessment, capital adequacy or similar requirement
     against letters of credit issued by the Issuing Bank or any Lender or
     (b) impose on the Issuing Bank or any Lender any other condition
     regarding any Letter of Credit, and the result of any event referred
     to in clauses (a) or (b) above shall be to increase the cost to the
     Issuing Bank or such Lender of issuing or maintaining such Letter of
     Credit from and after the Closing Date or a participation therein, as
     the case may be, then, within ten (10) Business Days after delivery to
     the Borrower by the Issuing Bank or such Lender of a certificate as to
     the fact and amount of such increased cost, the Borrower shall pay to
     the Issuing Bank or such Lender such additional amounts which shall be
     sufficient to compensate the Issuing Bank or such Lender for such
     increased cost, together with interest on each such amount from the
     date such certificate is received by the Borrower until payment in
     full thereof at the rate provided in Subsection 3.10.  A certificate
     as to the fact and amount of such increased cost incurred by the
     Issuing Bank or any Lender as a result of any event mentioned in
     clauses (a) or (b) above, submitted by the Issuing Bank or any such
     Lender to the Borrower, shall show the means by which such additional
     amounts have been calculated and shall be conclusive, absent manifest
     error.  This covenant shall survive the termination of this Agreement
     and payment of the outstanding Notes for a period of one year.

               3.13 Nature of Obligations; Indemnities.  (a)  The
                    ----------------------------------
     obligations of the Borrower under this Section 3 shall be absolute and
     unconditional under any and all circumstances and irrespective of any
     setoff, counterclaim or defense to payment which the Borrower may have
     or have had against the Issuing Bank, any correspondents of the
     Issuing Bank, the Agent, any Lender or any beneficiary of a Letter of
     Credit; provided that this provision shall be deemed a waiver by the
             --------
     Borrower of the assertion of a compulsory counterclaim only to the
     extent permitted by applicable law.  The Borrower assumes all risks of
     the acts or omissions of the users of the Letters of Credit and all
     risks of the misuse of the Letters of Credit.  None of the Issuing
     Bank, the Agent, any Lender, or any of their respective
     correspondents, shall be responsible: (i) for the form, validity,
     sufficiency, accuracy, genuineness or legal effect of any draft drawn
     under any Letter of Credit or any document specified in any
     applications for any of the Letters of Credit, even if it should in
     fact prove to be in any or all respects invalid, insufficient,
     inaccurate, fraudulent, or forged and even if the Borrower shall have
     notified the Issuing Bank, the Agent, any Lender, or any of their
     respective correspondents, thereof; (ii) for the validity or
     sufficiency of any instrument transferring or assigning or purporting
     to transfer or assign any of the Letters of Credit or any of the
     rights or benefits thereunder or proceeds thereof in whole or in part,
     which may prove to be invalid or ineffective for any reason; (iii) for
     failure of any draft to



















     
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<PAGE>
     

     bear any reference or adequate reference to any of the Letters of
     Credit, or failure of any document to accompany any draft upon
     presentation thereof, or failure of any Person to note the amount of
     any draft on the reverse of any of the Letters of Credit or to
     surrender or to take up any of the Letters of Credit or to send
     forward any such document apart from drafts as required by the terms
     of any of the Letters of Credit, each of which provisions, if
     contained in a Letter of Credit itself, it is agreed, may be waived by
     the Issuing Bank; (iv) for errors, omissions, interruptions or delays
     in transmission or delivery of any messages, by mail, cable,
     telegraph, telex or otherwise, whether or not in cipher; (v) for any
     error, neglect, default, suspension or insolvency of any
     correspondents of the Issuing Bank; (vi) for errors in translation or
     for errors in interpretation of technical terms; (vii) for any loss or
     delay, in the transmission or otherwise, of any such document or draft
     or of proceeds thereof; (viii) for any failure of any draft or
     document presented under a Letter of Credit to comply with, or for any
     determination by the Issuing Bank whether the same complies with, the
     terms of such Letter of Credit; (ix) compliance or non-compliance with
     any Requirements of Law or customs which may from time to time be in
     effect in foreign countries or jurisdictions in any way relating to
     any Letter of Credit or the negotiation and/or payment of any drawing
     under any Letter of Credit; (x) violation by any Person of any
     Requirement of Law; or (xi) for any other circumstances whatsoever in
     making or failing to make payment under a Letter of Credit; provided
                                                                 --------
      that the Borrower shall have a claim against the Issuing Bank, and
     the Issuing Bank shall be liable to the Borrower, to the extent, but
     only to the extent, of any direct, as opposed to consequential,
     damages suffered by the Borrower which the Borrower proves were caused
     by the Issuing Bank's willful misconduct or gross negligence.  None of
     the above shall affect, impair or prevent the vesting of any of the
     rights or powers of the Issuing Bank, the Agent or any of the Lenders. 
     The Issuing Bank or the Agent shall have the right to transmit the
     terms of the Letter of Credit as requested without translating them.

                    (b)  In furtherance and extension and not in limitation
     of the specific provisions hereinabove in this Section 3 set forth,
     (i) any action taken or omitted by the Issuing Bank, the Agent, any
     Lender or by any of their respective correspondents under or in
     connection with any of the Letters of Credit, if taken or omitted in
     good faith or pursuant to instructions of the Borrower, shall be
     binding upon the Borrower and shall not put the Issuing Bank, the
     Agent, any Lender or their respective correspondents under any
     resulting liability to the Borrower and (ii) the Issuing Bank may
     accept documents that appear on their face to be in order, without
     responsibility for further investigation, regardless of any notice or
     information to the contrary.  The Issuing Bank and its correspondents
     may, but shall not be required to, accept as complying with the terms
     of a Letter of Credit any drawing under the Letter of Credit or any
     other document, otherwise in order, signed or issued by the
     administrator, executor, trustee in bankruptcy, debtor in possession,
     assignee for benefit of





















     
<PAGE>

<PAGE>
     

     creditors, liquidator, receiver or other legal representative of the
     beneficiary of the Letter of Credit or of any other party who is
     authorized to draw under the Letter of Credit or who is authorized or
     required to execute documents in connection with the Letter of Credit.

                    (c)  The Borrower hereby agrees at all times to
     protect, indemnify and save harmless each of the Issuing Bank, the
     Agent, each Lender, and their respective correspondents, from and
     against any and all claims, actions, suits and other legal
     proceedings, and from and against any and all losses, claims, demands,
     liabilities, damages, costs, charges, reasonable counsel fees and
     other expenses which they or any of them may, at any time, sustain or
     incur by reason of or in consequence of or arising out of the issuance
     of any of the Letters of Credit; it being the intention of the parties
     that this Agreement shall be construed and applied to protect and
     indemnify each of the Issuing Bank, the Agent, each Lender, and their
     respective correspondents, against any and all risks involved in the
     issuance of all of the Letters of Credit, all of which risks, whether
     or not foreseeable, being hereby assumed by the Borrower, including,
     without limitation, any and all risks of all acts by any Governmental
     Authority, domestic or foreign; provided that the Borrower shall not
                                     --------
     be liable for the payment of any portion of such losses, liabilities,
     damages, costs, charges, counsel fees or other expenses resulting from
     any willful misconduct or gross negligence of the Person otherwise
     entitled to be indemnified.  None of the Issuing Bank, the Agent or
     any Lender, or any of their respective correspondents, shall in any
     way be liable for any failure by any of them or any other Person to
     pay a draft drawn under any of the Letters of Credit as a result of
     any acts, whether rightful or wrongful, of any Governmental Authority,
     or any other cause not readily within their control or the control of
     their respective correspondents, agents or sub-agents.  Without
     limiting the generality of the foregoing, the Borrower shall reimburse
     each of the Issuing Bank, the Agent, each Lender, and their respective
     correspondents, and shall pay and indemnify each of the Issuing Bank,
     the Agent, each Lender, and their respective correspondents, against
     payment of, out-of-pocket costs and expenses, withholding taxes,
     liabilities and damages, including, without limitation, counsel fees,
     incurred or sustained by any of them in connection with any of the
     Letters of Credit or by reason of any such failure to pay.  Also,
     without limiting the generality of the foregoing, the Borrower shall
     be responsible for, and shall reimburse the Issuing Bank, the Agent
     and each Lender forthwith upon its receipt of any demand therefor, any
     and all commissions, fees and other charges paid or payable by the
     Issuing Bank, the Agent or any Lender to any bank which shall be an
     advising bank or a beneficiary of a Letter of Credit which shall, in
     reliance thereon, have issued its own letter of credit in respect of
     obligations of the Borrower.

               3.14 Resignation of Issuing Bank.  The Issuing Bank may
                    ---------------------------
     resign as such by giving at least forty-five (45) days prior written
     notice to the Lenders, the Agent and the





















     
<PAGE>

<PAGE>
     

     Borrower of such resignation, specifying the date on which such
     resignation shall become effective.  On and after the effective date
     of such resignation, the Issuing Bank shall have no obligation to
     issue any Letters of Credit; provided that such resignation shall not
                                  --------
     affect any rights or obligations of the resigning Issuing Bank with
     respect to the Issuing Bank L/C Indemnification Agreement or any
     Letters of Credit issued prior to the effective date of such
     resignation.  In the event that the Issuing Bank shall give notice of
     its resignation as provided herein, the Required Lenders and the
     Borrower may appoint a successor Issuing Bank that is acceptable to
     the Required Lenders and the Borrower.  Such successor Issuing Bank
     shall undertake its duties as such upon execution and delivery by such
     Persons of such documents, including amendments of this Agreement, as
     shall be satisfactory to the Required Lenders and the Borrower.


               SECTION 4.  REPRESENTATIONS AND WARRANTIES

               To induce the Lenders to enter into this Agreement and to
     make the Revolving Credit Loans, and to induce the Issuing Bank to
     issue Letters of Credit and the Issuing Bank L/C Indemnification
     Agreement, the Borrower hereby represents and warrants to the Agent,
     the Issuing Bank and each Lender that:

               4.1  Financial Condition.  The following financial
                    -------------------
     statements of the Borrower have been delivered to the Agent, the
     Issuing Bank and each Lender:

                    (a)  the unaudited consolidated statement of income and
     retained earnings of the Borrower and its Subsidiaries for the fiscal
     year of the Borrower ended December 31, 1993, and the unaudited
     consolidated statement of cash flows of the Borrower and its
     Subsidiaries for such fiscal year, and the unaudited consolidated
     balance sheet of the Borrower and its Subsidiaries as at the end of
     such fiscal year;

                    (b)  the unaudited consolidated statement of income and
     retained earnings of the Borrower and its Subsidiaries and Symtron for
     the quarterly accounting period of the Borrower ended June 30, 1994,
     and the unaudited consolidated statement of cash flows of the Borrower
     and its Subsidiaries for such quarterly accounting period, and the
     unaudited consolidated balance sheet of the Borrower and its
     Subsidiaries as at the end of such quarterly accounting period;

                    (c)  The audited consolidated statement of income and
     retained earnings of UIC and its Subsidiaries for the fiscal year of
     UIC ended December 31, 1993, and the audited consolidated statement of
     cash flows of UIC and its Subsidiaries for such
























     
<PAGE>

<PAGE>
     

     fiscal year, and the audited consolidated balance sheet of UIC and its
     Subsidiaries as at the end of such fiscal year;

     The documents listed in this Subsection 4.1 have been prepared in
     conformity with GAAP consistently applied, are correct and complete,
     subject to normal year-end audit adjustments in the case of unaudited
     interim financial statements, and present fairly the financial
     position of the Borrower, its Subsidiaries and Symtron, and UIC and
     its Subsidiaries, as the case may be, as of the dates of such
     statements and the results of operations of the Borrower, its
     Subsidiaries and Symtron, and UIC and its Subsidiaries, as the case
     may be, for the periods indicated in such statements.

               4.2  Borrowing Base.  All accounts reported to the Agent or
                    --------------
     any Lender as Eligible Accounts, or included in any calculation of
     Eligible Accounts provided to the Agent or any Lender, shall be, to
     the knowledge and belief of the Borrower, at the time so reported or
     so included in such calculation, Eligible Accounts.

               4.3  No Change.  As of the Closing Date, there has been no
                    ---------
     material adverse change in the business, operations, property or
     financial or other condition of the Borrower and its Subsidiaries or
     of UIC and its Subsidiaries from the date of the most recent financial
     statements referred to in Subsection 4.1 hereof.

               4.4  Organization and Good Standing; Compliance with Law. 
                    ---------------------------------------------------
     The Borrower (a) is a corporation duly organized, validly existing and
     in good standing under the laws of the State of Maryland, (b) has the
     legal right to own and operate its property, to lease the property it
     operates as lessee and to conduct the business in which it is
     currently engaged, (c) is duly qualified and in good standing under
     the laws of each jurisdiction where the failure to be so qualified or
     in good standing would have a material adverse effect on its ability
     to own, lease or operate its property or conduct its business and (d)
     is in compliance with all Requirements of Law except to the extent
     that the failure to comply therewith could not, in the aggregate,
     reasonably be expected to have a Material Adverse Effect.

               4.5  Authorization; Enforceable Obligations.  The Borrower
                    --------------------------------------
     has the legal right to make, deliver and perform the Credit Documents
     to which it is a party and to borrow hereunder and has taken all
     necessary action to authorize the borrowings on the terms and
     conditions of this Agreement and the Notes and to authorize the
     execution, delivery and performance of the Credit Documents to which
     it is a party.  No consent or authorization of, filing with or other
     act by or in respect of any Governmental Authority is required in
     connection with the borrowings hereunder or with the execution,
     delivery, performance, validity or enforceability of the Credit
     Documents to which the Borrower is a party except





















     
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<PAGE>
     

     those which have been obtained or performed and are in full force and
     effect and those required to perfect Liens.  This Agreement has been,
     and each other Credit Document to which it is a party will be, duly
     executed and delivered on behalf of the Borrower.  This Agreement
     constitutes, and each other Credit Document to which it is a party
     when executed and delivered will constitute, a legal, valid and
     binding obligation of the Borrower enforceable against the Borrower in
     accordance with its terms, except as enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium or
     similar laws affecting the enforcement of creditors' rights generally
     and by general equitable principles (whether enforcement is sought by
     proceedings in equity or at law).

               4.6  No Legal Bar.  The execution, delivery and performance
                    ------------
     of the Credit Documents to which the Borrower is a party, the
     borrowings hereunder and the use of the proceeds thereof, will not
     violate any Requirement of Law or any Contractual Obligation of the
     Borrower, and will not result in, or require, the creation or
     imposition of any Lien on any of its properties or revenues pursuant
     to any Requirement of Law or Contractual Obligation, except as
     contemplated by the Credit Documents.

               4.7  No Material Litigation; Labor Matters.  No litigation,
                    -------------------------------------
     investigation or proceeding of or before any arbitrator or
     Governmental Authority is pending or, to the knowledge of the
     Borrower, threatened by or against the Borrower or against any of its
     properties or revenues (a) with respect to any of the Credit Documents
     or any of the transactions contemplated hereby or thereby, or
     (b) which, if determined adversely to the Borrower, could reasonably
     be expected to have a Material Adverse Effect.  There are no strikes,
     work stoppages, grievance proceedings or other controversies pending
     or, to the knowledge and belief of the Borrower, imminent or
     threatened between the Borrower and any employees of the Borrower or
     between the Borrower and any union or other collective bargaining unit
     representing employees of the Borrower which could reasonably be
     expected to have a Material Adverse Effect.  Except as set forth in
     Schedule 4.7, there is no litigation, investigation or proceeding of
     or before any arbitrator or Governmental Authority pending or, to the
     knowledge of the Borrower, threatened by or against the Borrower or
     against any of its properties or revenues.

               4.8  No Default.  There exists, as of the Closing Date, no
                    ----------
     "Event of Default," as defined in any of the Private Placement Debt
     Documents, and there exists no event which, with the giving of notice
     or the lapse of time, or both, could constitute an "Event of Default,"
     as defined in any of the Private Placement Debt Documents.  Except as
     set forth in Schedule 4.8, the Borrower is not in default under or
     with respect to any other Contractual Obligation in any respect which
     could reasonably be expected to have a Material Adverse Effect.  No
     Default or Event of Default has occurred and is continuing.





















     
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<PAGE>
     

               4.9  Ownership of Property; Liens.  The Borrower has good
                    ----------------------------
     record and marketable title in fee simple to the Real Property
     Collateral, and good title to all of its other property, and none of
     such property is subject to any Lien, except as permitted by
     Subsection 7.3.

               4.10 Business Premises.  The Borrower does not own, lease,
                    -----------------
     sublease, occupy, use or operate any real property or improvements
     other than the Borrower Business Premises.  The Borrower's chief
     executive office (within the meaning of Section 9-103 of the Maryland
     Uniform Commercial Code) is located at the Borrower Chief Executive
     Office.  All books and records of the Borrower are located at the
     Borrower Business Premises.

               4.11 Subsidiaries.  The Borrower has no Subsidiaries other
                    ------------
     than the Existing Borrower Subsidiaries.

               4.12 Ownership of Entities.  All of the issued and
                    ---------------------
     outstanding capital stock of each of the Borrower, Symtron and UIC -
      DEL is legally and beneficially owned by UIC and UIC has the
     discretionary power and right to exercise all rights and privileges,
     including voting rights, with respect to such capital stock and, more
     particularly, to elect all of the members of the Board of Directors of
     each of the Borrower, Symtron and UIC-DEL and to approve any action of
     each of the Borrower, Symtron and UIC-DEL, including extraordinary
     actions, required to be approved by the stockholders thereof.  All of
     the issued and outstanding capital stock of each of Systems,
     Technologies, Engineering, Carshell, International, Microflite,
     Medical and Seti is legally and beneficially owned by the Borrower and
     the Borrower has the discretionary power and right to exercise all
     rights and privileges, including voting rights, with respect to such
     capital stock and, more particularly, to elect all of the members of
     the Board of Directors of each of such corporations and to approve any
     action of each of such corporations, including extraordinary actions,
     required to be approved by the stockholders of such corporations.  The
     Borrower legally and beneficially owns fifty-three percent (53%) of
     the issued and outstanding capital stock of Transit and has the
     discretionary power and right to exercise all rights and privileges,
     including voting rights, with respect to such capital stock.

               4.13 Environmental.  To the Borrower's knowledge and except
                    -------------
     as set forth in Schedule 4.13:  (a) no Hazardous Substance has been
     released, discharged, emitted or disposed of on any of the Obligor Use
     Property except in compliance with Environmental Laws and except as
     could not reasonably be expected to result in the imposition of a Lien
     upon any of the property, assets or revenues of the Borrower, any of
     its Subsidiaries or any Other Obligor or exposure of the Borrower, any
     of its Subsidiaries or any Other Obligor to potential liability,
     whether for the cost of cure or remediation or otherwise, in excess of
     One



















     
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<PAGE>
     

     Hundred Thousand Dollars ($100,000.00); (b) there is no existing
     Hazardous Substance Contamination of any of the Obligor Use Property
     which could reasonably be expected to result in the imposition of a
     Lien upon any of the property, assets or revenues of the Borrower, any
     of its Subsidiaries or any Other Obligor or exposure of the Borrower,
     any of its Subsidiaries or any Other Obligor to potential liability,
     whether for the cost of cure or remediation or otherwise, in excess of
     One Hundred Thousand Dollars ($100,000.00); (c) all of the Obligor Use
     Property, and all operations now or previously conducted on the
     Obligor Use Property by the Borrower or any Guarantor, comply with all
     Environmental Laws, except for any non-compliance which could not
     reasonably be expected to result in the imposition of a Lien upon any
     of the property, assets or revenues of the Borrower, any of its
     Subsidiaries or any Other Obligor or exposure of the Borrower, any of
     its Subsidiaries or any Other Obligor to potential liability, whether
     for the cost of cure or remediation or otherwise, in excess of One
     Hundred Thousand Dollars ($100,000.00); (d) no underground storage
     tanks are located on any of the Obligor Use Property; and (e) neither
     the Borrower nor any Guarantor has received, or is aware of, any
     Environmental Claim against, relating to or affecting in any way the
     Borrower, any Guarantor or any of the Obligor Use Property or any
     operations conducted on any of the Obligor Use Property by the
     Borrower or any other Person which could reasonably be expected to
     result in the imposition of a Lien upon any of the property, assets or
     revenues of the Borrower, any of its Subsidiaries or any Other Obligor
     or exposure of the Borrower, any of its Subsidiaries or any Other
     Obligor to potential liability, whether for the cost of cure or
     remediation or otherwise, in excess of One Hundred Thousand Dollars
     ($100,000.00).

               4.14 Intellectual Property.  The only patents, patent
                    ---------------------
     applications, trademarks, trademark applications, servicemarks,
     servicemark applications, copyrights and copyright applications filed
     or registered in the name of the Borrower or any Guarantor (other than
     UIC) with the United States Patent and Trademark Office or the United
     States Copyright Office and not expired are set forth in
     Schedule 4.14.  The Borrower, each of its Subsidiaries and each
     Guarantor owns, or is licensed to use, all patents, trademarks,
     servicemarks, trade names, copyrights, technology, know-how and
     processes necessary for the conduct of its business as currently
     conducted (the "Intellectual Property").  Except as set forth in
     Schedule 4.14, no claim has been asserted and is pending by any Person
     with respect to the use of any such Intellectual Property, or
     challenging or questioning the validity or effectiveness of any such
     Intellectual Property, which, if determined adversely to the Borrower
     or any Guarantor, as the case may be, could reasonably be expected to
     have a Material Adverse Effect,  and the Borrower does not know of any
     valid basis for any such claim.  Except as set forth in Schedule 4.14,
     the use of such Intellectual Property by the Borrower does not
     infringe on the rights of any Person, subject to such claims and























     
<PAGE>

<PAGE>
     

     infringements as do not, in the aggregate, give rise to any material
     liability on the part of the Borrower.

               4.15 Solvency.  On the first Borrowing Date and after giving
                    --------
     effect to the borrowing hereunder on such date and to all other
     Indebtedness being incurred on such date in connection therewith
     (a) the sum of the assets, at a fair valuation, of the Borrower will,
     as of such date, exceed the Borrower's debts, (b) the present fair
     saleable value of the assets of the Borrower will, as of such date, be
     greater than the amount that will be required to pay the Borrower's
     liability on its debts as such debts become absolute and matured, and
     (c) the Borrower will have, as of such date, sufficient capital with
     which to conduct its business.  For purposes of this Subsection,
     "debt" means "liability on a claim", "claim" means any (i) right to
     payment, whether or not such a right is reduced to judgment,
     liquidated, unliquidated, fixed, contingent, matured, unmatured,
     disputed, undisputed, legal, equitable, secured or unsecured, or
     (ii) right to an equitable remedy for breach of performance if such
     breach gives rise to a right to payment, whether or not such right to
     an equitable remedy is reduced to judgment, fixed, contingent,
     matured, unmatured, disputed, undisputed, secured or unsecured.

               4.16 No Burdensome Restrictions.  No Contractual Obligation
                    --------------------------
     of the Borrower and no Requirement of Law materially adversely
     affects, or insofar as the Borrower could reasonably foresee may so
     affect, the business, operations, property or financial or other
     condition of the Borrower.

               4.17 Taxes.  Except as set forth in Schedule 4.17, the
                    -----
     Borrower has filed or caused to be filed all federal income and other
     material tax returns which are required to be filed by the Borrower,
     and the Borrower has paid all taxes shown to be due and payable on
     said returns or on any assessments made against it or any of its
     property and all other taxes, fees or other charges imposed on it or
     any of its property by any Governmental Authority (other than any
     taxes the amount or validity of which are currently being contested in
     good faith by appropriate proceedings and with respect to which
     reserves in conformity with GAAP have been provided on the books of
     the Borrower); and no tax lien has been filed and, to the knowledge of
     the Borrower, no claim is being asserted with respect to any such tax,
     fee or other charge.

               4.18 Federal Regulations.  No part of the proceeds of any
                    -------------------
     Revolving Credit Loans hereunder will be used for "purchasing" or
     "carrying" any "margin stock" within the respective meanings of each
     of the quoted terms under Regulation U of the Board of Governors of
     the Federal Reserve System as now and from time to time hereafter in
     effect or






















     
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<PAGE>
     

     for any purpose which violates the provisions of the Regulations of
     such Board of Governors. 








































































     
<PAGE>

<PAGE>
     

     If requested by any Lender or the Agent, the Borrower will furnish to
     the Agent and each Lender a statement to the foregoing effect in
     conformity with the requirements of FR Form U-I referred to in said
     Regulation U.

               4.19 ERISA.  Except as set forth in Schedule 4.19, to the
                    -----
     Borrower's knowledge, no Reportable Event has occurred during the
     five-year period prior to the date on which this representation is
     made or deemed made with respect to any Plan, and each Plan has
     complied in all material respects with the applicable provisions of
     ERISA and the Code.  Except as set forth in Schedule 4.19, the present
     value of all benefits vested under each Single Employer Plan
     maintained by the Borrower or any Commonly Controlled Entity (based on
     those assumptions used to fund the Plans) did not, as of the last
     annual valuation date, exceed the value of the assets of such Plan
     allocable to such vested benefits.  Neither the Borrower nor any
     Commonly Controlled Entity has had a complete or partial withdrawal
     from any Multiemployer Plan and neither the Borrower nor any Commonly
     Controlled Entity would become subject to any liability under ERISA if
     the Borrower or any such Commonly Controlled Entity were to withdraw
     completely from all Multiemployer Plans as of the valuation date most
     closely preceding the date hereof.  No such Multiemployer Plan is in
     Reorganization or Insolvent.

               4.20 Investment Company Act; Other Regulations.  The
                    -----------------------------------------
     Borrower is not an "investment company", or a company "controlled" by
     an "investment company", within the meaning of the Investment Company
     Act of 1940, as amended.  The Borrower is not subject to regulation
     under any Federal or state statute or regulation which limits its
     ability to incur Indebtedness.

               4.21 Accuracy and Completeness of Information.  At the time
                    ----------------------------------------
     furnished, no information, report or other paper or data with respect
     to the Borrower, any of its Subsidiaries or any of the Guarantors
     (other than projections) furnished to the Agent, the Issuing Bank or
     the Lenders by the Borrower, any of its Subsidiaries or any of the
     Guarantors, or on behalf of the Borrower, any of its Subsidiaries or
     any of the Guarantors, contained any untrue statement of a material
     fact or omitted to state a fact necessary to make the information or
     statements contained therein not materially misleading in light of the
     circumstances under which the same were made.  All projections with
     respect to the Borrower, any of its Subsidiaries or any of the
     Guarantors, so furnished by the Borrower, any of its Subsidiaries or
     any of the Guarantors, as supplemented, were prepared and presented in
     good faith, it being recognized by the Agent, the Issuing Bank and the
     Lenders that such projections as to future events are not to be viewed
     as facts and that actual results during the period or periods covered
     by any such projections will differ from the projected results.  As of
     the Closing Date, no fact is known to the Borrower which materially
     and





















     
<PAGE>

<PAGE>
     

     adversely affects or in the future may (so far as the Borrower can
     reasonably be expected to foresee) materially and adversely affect the
     business, assets or liabilities, financial condition, results of
     operations or business prospects of the Borrower, any of its
     Subsidiaries or any of the Guarantors, which has not been set forth in
     the financial statements referred to in Subsection 4.1 or in such
     information, reports, papers and data or otherwise disclosed in
     writing to the Agent, the Issuing Bank and the Lenders prior to the
     Closing Date.  No document furnished or statement made in writing to
     the Agent, the Issuing Bank or the Lenders by the Borrower in
     connection with the negotiation, preparation or execution of this
     Agreement contains any untrue statement of a material fact, or omits
     to state any fact necessary in order to make the statements contained
     therein not misleading in any material respect, in either case which
     has not been corrected, supplemented or remedied by subsequent
     documents furnished or statements made in writing to the Lenders.

               4.22 Certain Indebtedness.  After giving effect to any
                    --------------------
     payment or prepayment thereof occurring on the date hereof:  (a) the
     Private Placement Debt Balance is Twenty Million Dollars
     ($20,000,000.00); (b) the UIC Subordinated Debt Balance is zero;
     (c) the UIC-DEL Standby Subordinated Debt Balance is Twelve Million
     Dollars ($12,000,000.00); and (d) the UIC-DEL Subordinated Debt
     Balance is Seventeen Million Five Hundred Thousand Dollars
     ($17,500,000.00).

               4.23 Primary Banking Relationship.  The primary deposit
                    ----------------------------
     accounts, concentration accounts and disbursement accounts of the
     Borrower are located at First Fidelity.

               4.24 Purpose of Loans.  The proceeds of the Revolving Credit
                    ----------------
     Loans shall be used by the Borrower (a) to pay in full all
     Indebtedness of the Borrower and the Guarantors to Signet
     Bank/Maryland, except for contingent Indebtedness relating to the
     Indemnified Letters of Credit, (b) to finance the carry of accounts,
     the purchase of inventory, the funding of Capital Expenditures not
     prohibited by this Agreement, and other ordinary course business
     activities, (c) to make or fund any Transit Investment permitted under
     Subsection 7.11(e), and (d) to make loans or capital contributions to
     any Eligible Affiliate, the proceeds of which loans or capital
     contributions shall be used by such Eligible Affiliate to finance the
     carry of accounts, the purchase of inventory, the funding of Capital
     Expenditures not prohibited by this Agreement, and other ordinary
     course business activities.



























     
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               SECTION 5.  CONDITIONS PRECEDENT

               5.1  Conditions to Initial Extensions of Credit.  The
                    ------------------------------------------
     agreement of each Lender to make the initial Revolving Credit Loans
     requested to be made by it and the agreement of the Issuing Bank to
     open the initial Letters of Credit are subject to the satisfaction,
     immediately prior to or concurrently with the making of such Revolving
     Credit Loan on the Closing Date or the opening of such Letters of
     Credit, as the case may be, of the following conditions precedent:

                    (a)  Credit Documents.  The Agent shall have received
                         ----------------
     in form and content satisfactory to the Required Lenders (i) this
     Agreement, duly executed and delivered by an Authorized Officer of the
     Borrower and by each of the other parties hereto, with a counterpart
     for each Lender and the Issuing Bank, (ii) for the account of each
     Lender, a Revolving Credit Note, conforming to the requirements hereof
     and duly executed and delivered by an Authorized Officer of the
     Borrower, (iii) the Borrower Security Agreement, the Borrower Pledge
     Agreement, the Deed of Trust and a related Assignment of Leases and
     Rents, such L/C Agreements as may be required by the Issuing Bank, and
     such Intellectual Property Assignments as may be required by the
     Required Lenders, each duly executed and delivered by an Authorized
     Officer of the Borrower, with a counterpart or a conformed copy for
     each Lender and the Issuing Bank, (iv) the Guaranty, duly executed and
     delivered by an Authorized Officer of each of the Guarantors, (v) the
     Guarantor Security Agreement, duly executed by an Authorized Officer
     of each of the Guarantors (other than UIC), (vi) such Intellectual
     Property Assignments as the Agent may require to be executed by any of
     Guarantors (other than UIC), each duly executed and delivered by an
     Authorized Officer of each of such Guarantors, (vii) the UIC Pledge
     Agreement and the UIC Subordination Agreement, each duly executed and
     delivered by an Authorized Officer of UIC and by each of the other
     parties thereto, (viii) the UIC-DEL Subordination Agreement, duly
     executed and delivered by an Authorized Officer of UIC-DEL and by each
     of the other parties thereto, and (ix) such financing statements,
     security agreements, assignments and other documents executed by such
     Persons as the Agent may reasonably require to further evidence or
     perfect the rights and interests granted or contemplated to be granted
     to or for the benefit of the Agent, the Lenders or the Issuing Bank
     pursuant to this Agreement and the other Credit Documents.

                    (b)  Private Placement Debt Documents; Certificates;
                         -----------------------------------------------
     Conditions.  The Agent shall have received a true and correct copy of
     ----------
     each of the Private Placement Debt Documents, including all schedules
     and exhibits thereto and side letters affecting the terms thereof or
     otherwise delivered in connection therewith.
























     
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                    (c)  Intercreditor Agreement.  The Agent shall have
                         -----------------------
     received, with a counterpart or a conformed copy for each Lender and
     the Issuing Bank, the Intercreditor Agreement duly executed and
     delivered by an Authorized Officer of each of the other parties
     thereto.

                    (d)  Consents.  The Agent shall have received, with
                         --------
     copies and executed certificates for each Lender and the Issuing Bank,
     true copies (in each case certified as to authenticity on such date by
     an Authorized Officer of the Borrower) of all documents and
     instruments, including all consents, authorizations and filings,
     required or advisable under any Requirement of Law or by Contractual
     Obligations of the Borrower or any Guarantor in connection with the
     execution, delivery, performance, validity and enforceability of this
     Agreement, the Notes, the other Credit Documents and the Intercreditor
     Agreement, and such consents, authorizations, and filings shall be
     satisfactory in form and substance to the Required Lenders and in full
     force and effect.

                    (e)  Related Agreements.  The Agent shall have
                         ------------------
     received, with a counterpart or a conformed copy for each Lender and
     the Issuing Bank, true and correct copies, certified as to
     authenticity by the Borrower, of such contracts, documents or
     instruments to which the Borrower or any Guarantor is a party as may
     be reasonably requested by the Agent or any Lender, including, without
     limitation, a copy of any debt instrument or security agreement to
     which the Borrower or any Guarantor is a party.

                    (f)  Title Insurance.  The Agent shall have received a
                         ---------------
     written commitment by a title insurance company to issue title
     insurance insuring the Deed of Trust, which commitment and which
     company shall be satisfactory to the Agent, the Issuing Bank and the
     Required Lenders.

                    (g)  Environmental Assessment.  The Agent shall have
                         ------------------------
     received an Environmental Assessment relating to the Real Property
     Collateral performed by a contractor satisfactory to the Agent, the
     Issuing Bank and the Required Lenders, which Environmental Assessment
     shall be satisfactory to the Agent, the Issuing Bank and the Required
     Lenders.

                    (h)  Appraisals.  The Agent shall have received, with a
                         ----------
     counterpart for each Lender and the Issuing Bank, an appraisal or
     appraisals of the Real Property Collateral and other fixed assets of
     the Borrower performed by an appraiser or appraisers satisfactory to
     the Agent, which appraisal or appraisals shall indicate that the Real
     Property Collateral (on a market value basis) and the other fixed
     assets of the Borrower (on a forced sale value basis) have an
     aggregate value of at least Twenty Million Dollars ($20,000,000.00),
     and which appraisals shall be satisfactory to the Agent.


















     
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                    (i)  Borrowing Certificate.  The Agent shall have
                         ---------------------
     received, with a counterpart for each Lender, a Borrowing Certificate
     of the Borrower, dated the Closing Date, substantially in the form of
     Exhibit G, with appropriate insertions and attachments, satisfactory
     in form and substance to the Agent and its counsel, duly executed by
     an Authorized Officer of the Borrower.

                    (j)  Borrowing Base Certificate.  The Agent shall have
                         --------------------------
     received, with a counterpart for each Lender, a Borrowing Base
     Certificate, dated the Closing Date, fully completed and duly executed
     by an Authorized Officer of the Borrower.

                    (k)  Borrower Proceedings.  The Agent shall have
                         --------------------
     received, with a counterpart for each Lender and the Issuing Bank, a
     copy of all corporate proceedings undertaken by the Borrower, in form
     and substance satisfactory to the Required Lenders, authorizing
     (i) the execution, delivery and performance of the Intercreditor
     Agreement, this Agreement, the Notes and the other Credit Documents to
     which it is a party, (ii) the borrowings contemplated hereunder and
     (iii) the granting by it of the security interests and other Liens
     granted by it pursuant to the Credit Documents, certified as to
     authenticity by an Authorized Officer of the Borrower, as of the
     Closing Date, which certificate shall state that the proceedings
     thereby certified are in full force and effect and have not been
     amended, modified, revoked or rescinded as of the date of such
     certificate.

                    (l)  Guarantor Proceedings.  The Agent shall have
                         ---------------------
     received, with a counterpart for each Lender and the Issuing Bank, a
     copy of all corporate proceedings undertaken by each of the
     Guarantors, in form and substance satisfactory to the Required Lenders
     authorizing (i) the execution, delivery and performance of each of the
     Credit Documents to which it is a party, and (ii) the granting by it
     of the security interests and other Liens granted by it pursuant to
     the Credit Documents, certified as to authenticity by an Authorized
     Officer of such Guarantor as of the Closing Date, which certificate
     shall state that the proceedings thereby certified are in full force
     and effect and have not been amended, modified, revoked or rescinded
     as of the date of such certificate.

                    (m)  Borrower and Guarantor Incumbency Certificate. 
                         ---------------------------------------------
     The Agent shall have received, with a counterpart for each Lender and
     the Issuing Bank, a certificate of an Authorized Officer of each of
     the Borrower and each Guarantor, dated the Closing Date, as to the
     incumbency and signature of the Authorized Officers of the Borrower
     and the Guarantors executing any Credit Document, satisfactory in form
     and substance to the Required Lenders and their counsel, duly executed
     by an Authorized Officer of the Borrower and each of the Guarantors.





















     
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                    (n)  Borrower and Guarantor Organizational Documents. 
                         -----------------------------------------------
     The Agent shall have received, with a counterpart for each Lender and
     the Issuing Bank, true and complete copies of the certificate of
     incorporation and bylaws of the Borrower and each of the Guarantors,
     certified as of the Closing Date as true and complete copies thereof
     by an Authorized Officer of the Borrower and each of the Guarantors.

                    (o)  Good Standing Certificates.  The Agent shall have
                         --------------------------
     received copies of certificates dated as of a recent date from the
     Secretary of State or other appropriate authority of such
     jurisdiction, evidencing the good standing of the Borrower and each of
     the Guarantors in each state where the ownership, lease or operation
     of property or the conduct of the business of the Borrower or any of
     the Guarantors requires it to qualify and where the failure to so
     qualify could not reasonably be expected to have a Material Adverse
     Effect, assuming the Agent were liquidating all of the Collateral.

                    (p)  Financial Information.  The Agent shall have
                         ---------------------
     received, with a counterpart for each Lender and the Issuing Bank, a
     copy of each of the financial statements referred to in
     Subsection 4.1.

                    (q)  Litigation.  No suit, action, investigation,
                         ----------
     inquiry or other proceeding (including, without limitation, the
     enactment or promulgation of a statute or rule) by or before any
     arbitrator or any Governmental Authority shall be pending and no
     preliminary or permanent injunction or order by a state or federal
     court shall have been entered (i) in connection with any Credit
     Document, the Private Placement Debt Documents, the Intercreditor
     Agreement or any of the transactions contemplated hereby or thereby or
     (ii) which, in any such case, in the judgment of the Required Lenders,
     would have a Material Adverse Effect.

                    (r)  No Violation.  The consummation of the
                         ------------
     transactions contemplated hereby and by the Intercreditor Agreement
     shall not contravene, violate or conflict with, nor involve the Agent,
     any Lender or the Issuing Bank in a violation of, any Requirement of
     Law.

                    (s)  Consents, Licenses, Approval, Etc.  The Agent
                         ---------------------------------
     shall have received, with a counterpart for each Lender and the
     Issuing Bank, a certificate of an Authorized Officer of the Borrower
     either (i) attaching copies of all consents, licenses and approvals
     required in connection with the execution, delivery and performance by
     the Borrower and the Guarantors, and the validity and enforceability
     against the Borrower and the Guarantors of, the Credit Documents, and
     such consents, licenses and approvals shall be





















     
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     in full force and effect, or (ii) stating that no such consents,
     licenses or approvals are so required.

                    (t)  Delivery of Stock Certificates.  There shall have
                         ------------------------------
     been delivered to the Agent, together with stock powers relating
     thereto duly executed in blank, stock certificates evidencing the
     Borrower Subsidiary Pledged Stock and the UIC Subsidiary Pledged
     Stock.

                    (u)  Fees.  The Agent shall have received, for the
                         ----
     account of the Lenders, pro rata according to their Commitment
                             --- ----
     Percentages, a facility fee equal to Seventy-Five Thousand Dollars
     ($75,000.00).

                    (v)  Filings, Registrations and Recordings.  All
                         -------------------------------------
     filings, registrations and recordings necessary, in the judgment of
     the Agent, any Lender or the Issuing Bank, to perfect or make
     enforceable any security interest or other Lien granted to or for the
     benefit of the Agent, any Lender or the Issuing Bank pursuant to the
     Credit Documents shall have been properly filed, registered or
     recorded.  The Agent shall have received evidence satisfactory to the
     Required Lenders of each such filing, registration or recordation and
     of the payment of any necessary fee, tax or expense relating thereto.

                    (w)  Lien Searches.  The Agent shall have received in
                         -------------
     writing the results of recent searches by a Person satisfactory to the
     Agent, of the Uniform Commercial Code filings which may have been
     filed with respect to personal property of the Borrower and each of
     the Guarantors, which searches shall indicate that there are no
     financing statements on file against the Borrower or any of the
     Guarantors except for financing statements publicizing Permitted Liens
     and financing statements for which duly executed termination
     statements in recordable form have been delivered to counsel to the
     Agent for filing.

                    (x)  Insurance.  The Agent shall have received evidence
                         ---------
     satisfactory to the Required Lenders that the Borrower and each of the
     Guarantors has obtained such insurance in such amounts, against such
     risks and issued by such companies as shall be satisfactory to the
     Required Lenders.

                    (y)  Legal Opinions.  The Agent shall have received,
                         --------------
     with a counterpart for each Lender, the executed legal opinion of in-
     house counsel to the Borrower and the Guarantors, in form and content
     satisfactory to the Required Lenders.  Such legal opinion shall cover
     such matters incident to the transactions contemplated by this
     Agreement,




















     
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     the other Credit Documents, the Private Placement Debt Documents and
     the Intercreditor Agreement as the Agent or any Lender may reasonably
     require.

                    (z)  Accounts Dilution.  The Agent shall have completed
                         -----------------
     a field examination relating to the accounts of the Borrower and its
     Subsidiaries, and the Agent shall have concluded on the basis of such
     examination that noncash items chargeable to such accounts do not
     exceed seven and one-half percent (7.5%) of the aggregate amount of
     such accounts.

                    (aa) Landlord Agreements.  The Agent shall have
                         -------------------
     received in form and content satisfactory to the Agent a written
     agreement of each owner of the business premises of the Borrower at
     2801 Professional Parkway, Ocoee, Florida, the business premises of
     Symtron at 17-01 Pollitt Drive, Fair Lawn, New Jersey, and the
     business premises of Systems and Engineering at 11101 Gilroy Road,
     Hunt Valley, Maryland, in each case, consenting to, and subordinating
     liens against the Collateral of such owner to, the security interests
     in the Collateral granted to the Agent and enforcement of the Agent's
     rights in connection therewith.

                    (bb) Title Insurance Company Charges.  Not later than
                         -------------------------------
     immediately after the Lenders make their initial Revolving Credit
     Loans on the Closing Date, there shall have been paid by the Borrower
     in full all costs, title examination fees and title insurance premiums
     payable to the title insurance company insuring the Deed of Trust.

               5.2  Conditions to Each Loan and Each Letter of Credit.  The
                    -------------------------------------------------
      agreement of each Lender to make any Revolving Credit Loan requested
     to be made by it on any date (including, without limitation, its
     initial Revolving Credit Loan requested to be made by it) and the
     agreement of the Issuing Bank to open, renew or extend any Letter of
     Credit requested to be opened, renewed or extended on any date, is
     subject to the satisfaction of the following conditions precedent as
     of the date such Revolving Credit Loan or Letter of Credit is
     requested to be made, opened, renewed or extended:

                    (a)  Representations and Warranties.  Each of the
                         ------------------------------
     representations and warranties made by the Borrower and the Guarantors
     in or pursuant to the Credit Documents, except for those made as of a
     named date only and except as otherwise agreed from time to time in
     accordance with the provisions of this Agreement, shall be true and
     complete in all material respects on and as of such date as if made on
     and as of such date.
























     
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                    (b)  No Default.  No Default or Event of Default shall
                         ----------
     be continuing on such date or after giving effect to the Revolving
     Credit Loans or the Letters of Credit requested to be made, opened,
     renewed or extended, as the case may be, on such date.

                    (c)  No Material Litigation.  No Material Litigation
                         ----------------------
     shall be pending or overtly threatened against the Borrower or any of
     the Guarantors.

                    (d)  No Material Adverse Change.  There shall not have
                         --------------------------
     occurred any event since the date of the financial statements referred
     to in Subsection 4.1 which had a Material Adverse Effect.

                    (e)  Additional Documents.  The Agent shall have
                         --------------------
     received each additional document, instrument, legal opinion or item
     of information reasonably requested by the Agent, any Lender or the
     Issuing Bank.

                    (f)  Additional Matters.  All corporate and other
                         ------------------
     proceedings, and all documents, instruments and other legal matters in
     connection with the transactions contemplated by this Agreement, the
     other Credit Documents, the Private Placement Debt Documents and the
     Intercreditor Agreement shall be satisfactory in form and substance to
     the Agent, in its discretion reasonably exercised, and the Agent shall
     have received such other documents, legal opinions and other opinions
     in respect of any aspect or consequence of the transactions
     contemplated hereby or thereby as the Agent or any Lender  shall
     reasonably request.  Each borrowing by the Borrower hereunder and
     issuance, renewal or extension of each Letter of Credit shall
     constitute a representation and warranty by the Borrower as of the
     date of such borrowing, issuance, renewal or extension, as the case
     may be, that the conditions contained in this Subsection 5.2 have been
     satisfied.


               SECTION 6.  AFFIRMATIVE COVENANTS

               The Borrower hereby agrees that, so long as the Commitments
     remain in effect, any Note or L/C Reimbursement Obligation remains
     outstanding and unpaid, any Letter of Credit remains outstanding or
     any amount is owing to any Lender, the Agent or the Issuing Bank
     hereunder or under any other of the Credit Documents, the Borrower
     shall:

               6.1  Financial Information.  Furnish to the Agent, each
                    ---------------------
     Lender and the Issuing Bank in writing:






















     
<PAGE>

<PAGE>
     

                    (a)  on each Business Day, a Borrowing Base Certificate
     as of the close of business on the preceding Business Day;

                    (b)  not later than twenty (20) days after the end of
     each monthly accounting period of the Borrower and in form and content
     satisfactory to the Required Lenders, in their discretion reasonably
     exercised  (i) a Certified schedule and aging of accounts payable of
     the Borrower, its Subsidiaries (other than Transit) and each other of
     the Guarantors (other than UIC) as at the end of such monthly
     accounting period, (ii) a Certified schedule and aging of accounts of
     the Borrower, its Subsidiaries (other than Transit) and each other of
     the Guarantors (other than UIC) as at the end of such monthly
     accounting period, (iii) an aged backlog report of the Borrower, its
     Subsidiaries (other than Transit) and each other of the Guarantors
     (other than UIC), (iv) a listing of open contracts of the Borrower,
     its Subsidiaries (other than Transit) and each other of the Guarantors
     (other than UIC), with a status report as to each, and (v) a
     reconciliation of the accounts of the Borrower, its Subsidiaries
     (other than Transit) and each other of the Guarantors (other than
     UIC);

                    (c)  not later than forty-five (45) days after the end
     of each of the first three (3) quarterly accounting periods of the
     Borrower in each fiscal year of the Borrower and in form and content
     satisfactory to the Required Lenders, in their discretion reasonably
     exercised, a consolidated and consolidating statement of income and
     retained earnings of the Borrower and its Subsidiaries (other than
     Transit) and Symtron for such quarterly accounting period and for the
     current fiscal year of the Borrower through the end of such quarterly
     accounting period, and a consolidated and consolidating statement of
     cash flows of the Borrower and its Subsidiaries (other than Transit)
     and Symtron for such quarterly accounting period and for the current
     fiscal year of the Borrower through the end of such quarterly
     accounting period, and a consolidated and consolidating balance sheet
     of the Borrower and its Subsidiaries (other than Transit) and Symtron
     as at the end of such quarterly accounting period, all prepared in
     accordance with GAAP consistently applied and accompanied by (i) an
     Officer Reliance Certificate with respect to such financial
     statements, (ii) an Officer Default Certificate as at the end of such
     quarterly accounting period, and (iii) an Officer Financial Covenant
     Certificate as at the end of such quarterly accounting period;

                    (d)  not later forty-five (45) days after the end of
     each of the first three (3) quarterly accounting periods in each
     fiscal year of UIC and in form and content satisfactory to the
     Required Lenders in their discretion reasonably exercised, a
     consolidated statement of income and retained earnings of UIC and its
     Subsidiaries for such quarterly accounting period and for the current
     fiscal year of UIC through the end of such quarterly

























     
<PAGE>

<PAGE>
     

     accounting period, and a consolidated statement of cash flows of UIC
     and its Subsidiaries for such quarterly accounting period and for the
     current fiscal year of UIC through the end of such quarterly
     accounting period, and a consolidated balance sheet of UIC and its
     Subsidiaries as at the end of such quarterly accounting period, all
     prepared in accordance with GAAP consistently applied;

                    (e)  not later than fifteen (15) days after the end of
     each quarterly accounting period of the Borrower and in form and
     content satisfactory to the Agent in its discretion reasonably
     exercised, a report concerning the status of pending litigation and
     proceedings involving the Borrower or any Eligible Affiliate;

                    (f)  not later than ninety (90) days after the end of
     each fiscal year of the Borrower, a consolidated statement of income
     and retained earnings of the Borrower and its Subsidiaries (other than
     Transit) for such fiscal year, and a consolidated statement of cash
     flows of the Borrower and its Subsidiaries (other than Transit) for
     such fiscal year, and a consolidated balance sheet of the Borrower and
     its Subsidiaries (other than Transit) as at the end of such fiscal
     year, setting forth in each case in comparative form corresponding
     figures for the preceding fiscal year of the Borrower, all prepared in
     accordance with GAAP consistently applied and examined and audited by
     independent certified public accountants satisfactory to the Required
     Lenders in their discretion reasonably exercised, and accompanied by
     (i) a clean unqualified report of such independent certified public
     accountants with respect to such financial statements, (ii) copies of
     each management report, management letter or the like issued by such
     independent certified public accountants in connection with such
     financial statements (unless the same have not previously been
     delivered to the Borrower or UIC, in which event the same shall be
     furnished not later than fourteen (14) days after receipt by the
     Borrower or UIC), (iii) an Accountant Default Certificate, (iv) an
     Officer Financial Covenant Certificate as at the end of such fiscal
     year, and (v) an Officer Default Certificate as at the end of such
     fiscal year;

                    (g)  not later than ninety (90) days after the end of
     each fiscal year of UIC, a consolidated statement of income and
     retained earnings of UIC and its Subsidiaries for such fiscal year,
     and a consolidated statement of cash flows of UIC and its Subsidiaries
     for such fiscal year, and a consolidated balance sheet of UIC and its
     Subsidiaries as at the end of such fiscal year, setting forth in each
     case in comparative form corresponding figures for the preceding
     fiscal year of UIC, all prepared in accordance with GAAP consistently
     applied and examined and audited by independent certified public
     accountants satisfactory to the Required Lenders in their discretion
     reasonably exercised, and accompanied by (i) a clean unqualified
     report of such independent certified public accountants with respect
     to such financial statements, and (ii) copies of each management
     report, management letter or the























     
<PAGE>

<PAGE>
     

     like issued by such independent certified public accountants in
     connection with such financial statements (unless the same have not
     previously been delivered to the Borrower or UIC, in which event the
     same shall be furnished not later than fourteen (14) days after
     receipt by the Borrower or UIC); 

                    (h)  not later than forty-five (45) days after the end
     of each fiscal year of the Borrower and in form and content
     satisfactory to the Required Lenders in their discretion reasonably
     exercised, projections by the Borrower, on a quarter-by-quarter basis,
     of the financial condition and results of operations of the Borrower
     and its Subsidiaries (other than Transit) for the succeeding fiscal
     year of the Borrower, accompanied by a certificate of an Authorized
     Officer of the Borrower to the effect that such projections have been
     prepared in good faith on the basis of sound financial planning
     practice and reasonable assumptions;

                    (i)  promptly after transmission thereof, copies of all
     registration statements and all regular, special or periodic reports
     which UIC, any of its Subsidiaries, the Borrower or any of its
     Subsidiaries files with the United States Securities and Exchange
     Commission (or any successor thereto) or with any stock exchange, and
     copies of all press releases and other statements issued by UIC, any
     of its Subsidiaries, the Borrower or any of its Subsidiaries to the
     public;

                    (j)  promptly after request by the Agent, any Lender or
     the Issuing Bank, copies of any or all purchase orders, invoices,
     evidences of shipment, delivery or other contract performances of the
     Borrower or any of the Guarantors, and other documents relating to any
     contracts, accounts or inventory of the Borrower or any of the
     Guarantors; and

                    (k)  promptly, such additional financial and other
     information as the Agent, any Lender or the Issuing Bank may from time
     to time reasonably request.

               6.2  Payment of Obligations.  Pay, discharge or otherwise
                    ----------------------
     satisfy at or before maturity or before they become delinquent, as the
     case may be, all of its obligations to the Private Placement Debt
     Holders under or in connection with the Private Placement Debt
     Documents, all of its obligations to Signet Bank/Maryland under or in
     connection with the Indemnified Letters of Credit and all
     reimbursement and other agreements relating thereto, and all of its
     obligations of whatever nature; and cause each of its Subsidiaries and
     each Guarantor to pay, discharge or otherwise satisfy at or before
     maturity or before they become delinquent, as the case may be, all of
     its obligations of whatever nature; provided that nothing contained in
                                         --------
     this Subsection shall be construed to require the Borrower, any of























     
<PAGE>

<PAGE>
     

     its Subsidiaries or any Guarantor to refrain from contesting the
     validity, enforceability, amount, maturity or delinquency of any
     alleged obligations.

               6.3  Conduct of Business and Maintenance of Existence. 
                    ------------------------------------------------
     Continue to, and cause each of its Subsidiaries to continue to, engage
     in business of the same general type as now conducted by it; and
     preserve, renew and keep in full force and effect, and cause each of
     its Subsidiaries to preserve, renew and keep in full force and effect,
     its corporate existence; take, and cause each of its Subsidiaries to
     take, all reasonable action to maintain all rights, privileges and
     franchises necessary or desirable in the normal conduct of its
     business; comply with, and cause each of its Subsidiaries to comply
     with, all Contractual Obligations and Requirements of Law except to
     the extent that failure to comply therewith could not, in the
     aggregate, reasonably be expected to have a Material Adverse Effect.

               6.4  Maintenance of Property; Insurance.  (a)  Keep, and
                    ----------------------------------
     cause each of its Subsidiaries to keep, all property useful and
     necessary in its business in good working order and condition; and
     (b) maintain, and cause each of its Subsidiaries to  maintain, with
     financially sound and reputable insurance companies such insurance in
     at least such amounts and against at least such risks (but including
     in any event property casualty, liability, product liability and
     business interruption) as would be reasonably prudent, all such
     insurance to be acceptable to the Required Lenders, in their
     discretion reasonably exercised; and furnish to the Agent, each Lender
     and the Issuing Bank, upon written request, full information as to the
     insurance carried.

               6.5  Inspection of Property; Books and Records; Discussions.
                    ------------------------------------------------------
     Keep, and cause each of its Subsidiaries to keep, proper books of
     records and account in which true and complete entries in conformity
     with GAAP and all Requirements of Law shall be made of all dealings
     and transactions in relation to its business and activities; permit
     representatives of the Agent, any Lender and the Issuing Bank to visit
     and inspect any of its properties and examine and make abstracts from
     any of its books and records at any reasonable time and as often as
     may reasonably be desired, and to discuss the business, operations,
     properties and financial and other condition of the Borrower and any
     of its Subsidiaries with any of the Authorized Officers of the
     Borrower and with its independent certified public accountants; the
     Borrower hereby acknowledging the intention of the Lenders to, and the
     Borrower hereby authorizing and agreeing that the Lenders may (a) at
     the Borrower's expense, conduct field examinations of the contracts,
     accounts, cost accountings and other matters relating to the Borrower
     and its Subsidiaries (other than Transit) as often as the Lenders
     desire to do so, the Lenders hereby agreeing in connection with any
     such examination to execute and deliver to the Borrower, if requested
     by the Borrower and reasonably determined by the Borrower to be
     necessary to protect proprietary information, an agreement not to
     disclose such information,



















     
<PAGE>

<PAGE>
     

     subject to requirements of law and legal process and other customary
     exceptions, and (b) verify accounts of the Borrower and its
     Subsidiaries (other than Transit) by such means as the Lenders may
     determine, including, without limitation, written and oral
     communications with account debtors and other obligors of the Borrower
     and its Subsidiaries.

               6.6  Notices.  Promptly give notice to the Agent, each
                    -------
     Lender and the Issuing Bank:

                    (a)  of the occurrence of any Default or Event of
     Default;

                    (b)  of any (i) material default or material event of
     default under or as defined in any Contractual Obligation of the
     Borrower, any of its Subsidiaries or any of the Guarantors, or
     (ii) Material Litigation pending or overtly threatened against the
     Borrower, any of its Subsidiaries or any of the Guarantors;

                    (c)  of any litigation or proceeding affecting the
     Borrower, any of its Subsidiaries or any of the Guarantors involving
     an uninsured amount of Five Hundred Thousand Dollars ($500,000.00) or
     more or in which injunctive or similar relief is sought;

                    (d)  of the following events and not later than fifteen
     (15) days after the Borrower knows or has reason to know thereof: (i)
     the occurrence or expected occurrence of any Reportable Event with
     respect to any Plan, or any withdrawal from, or the termination,
     Reorganization or Insolvency of, any Multiemployer Plan or (ii) the
     institution of proceedings or the taking of any other action by the
     PBGC or the Borrower or any Commonly Controlled Entity or any
     Multiemployer Plan with respect to the withdrawal from, or the
     terminating, Reorganization or Insolvency of, any Plan; and

                    (e)  of the occurrence of any event which could
     reasonably be expected to have a Material Adverse Effect.

     Each notice pursuant to this Subsection shall be accompanied by a
     statement of an Authorized Officer setting forth details of the
     occurrence referred to therein and stating what action the Borrower
     proposes to take with respect thereto.  For all purposes of clause (d)
     of this Subsection, to the extent provided in ERISA, the Borrower
     shall be deemed to have all knowledge or knowledge of all facts
     attributable to the administrator of such Plan.

               6.7  Government Regulations.  Comply with all applicable
                    ----------------------
     Requirements of Law relating to the conduct of its business,
     including, without limitation, regulations relating
























     
<PAGE>

<PAGE>
     

     to defense procurement, the failure with which to comply could
     reasonably be expected to have a Material Adverse Effect.

               6.8  Environmental.  Except as set forth in Schedule 4.13,
                    -------------
     cause all operations now or hereafter conducted on any Obligor Use
     Property to be conducted in compliance in all material respects with
     all applicable Environmental Laws and so that no non-compliance could
     reasonably be expected to have a Material Adverse Effect or result in
     the imposition of a Lien upon any of the property, assets or revenues
     of the Borrower, any of its Subsidiaries or any Other Obligor or
     exposure of the Borrower, any of its Subsidiaries or any Other Obligor
     to potential liability, whether for the cost of cure or remediation or
     otherwise, in excess of One Hundred Thousand Dollars ($100,000.00);
     promptly deliver to the Agent copies of all reports prepared by any
     Governmental Authority, any environmental auditor or engineer, or any
     other Person, relating to or in connection with compliance by the
     Borrower, any of its Subsidiaries or any of the Guarantors with any
     Environmental Laws, unless the Borrower cannot obtain such reports or
     copies thereof; notify the Agent, each Lender and the Issuing Bank in
     writing within thirty (30) days after the Borrower, any of its
     Subsidiaries or any of the Guarantors shall have received any
     Environmental Claim which could reasonably be expected to have a
     Material Adverse Effect or result in the imposition of a Lien upon any
     of the property, assets or revenues of the Borrowers, any of its
     Subsidiaries or any Other Obligor or exposure of the Borrower, any of
     its Subsidiaries or any Other Obligor to potential liability, whether
     for the cost of cure or remediation or otherwise, in excess of One
     Hundred Thousand Dollars ($100,000.00); in the event that, to the
     knowledge of the Borrower, any of its Subsidiaries or any of the
     Guarantors, any Hazardous Substance Contamination shall occur, or the
     Borrower shall become aware of any non-compliance in any respect with
     any Environmental Law by the Borrower, any of its Subsidiaries or any
     of the Guarantors, any Obligor Use Property or any operations
     previously, now or hereafter conducted on any Obligor Use Property,
     and, in either case, the same could reasonably be expected to have a
     Material Adverse Effect or result in the imposition of a Lien upon any
     of the property, assets or revenues of the Borrower, any of its
     Subsidiaries or any Other Obligor or exposure of the Borrower, any of
     its Subsidiaries or any Other Obligor to potential liability, whether
     for the cost of cure or remediation or otherwise, in excess of One
     Hundred Thousand Dollars ($100,000.00) (i) notify the Agent thereof in
     writing within ten (10) Business Days, (ii) if requested by the
     Required Lenders, engage, at the Borrower's expense, and deliver to
     the Agent as promptly as feasible, with sufficient copies for each
     Lender and the Issuing Bank, an Environmental Assessment with respect
     thereto containing or accompanied by a plan and budget in form and
     content satisfactory to the Required Lenders for the remediation or
     cure thereof, (iii) as promptly as feasible, commence and diligently
     pursue to completion, or cause to be promptly commenced and diligently
     pursued to completion, all actions which are necessary to comply with
     Environmental Laws or to






















     
<PAGE>

<PAGE>
     

     remediate or cure the same, all contractors to perform any work in
     connection therewith to be satisfactory to the Required Lenders, in
     their discretion reasonably exercised, and (iv) if requested by the
     Required Lenders, deliver to the Agent, within fifteen (15) days after
     request therefor by the Required Lenders, a bond, letter of credit or
     similar financial assurance reasonably satisfactory to the Required
     Lenders evidencing that the funds necessary are available to pay the
     cost of any cure or remediation; and indemnify, protect and defend
     each of the Agent, the Lenders and the Issuing Bank, and their
     officers, directors, employees, attorneys and agents, and save
     harmless the Agent, the Lenders and the Issuing Bank, and their
     officers, directors, employees, attorneys and agents, from and against
     any and all claims, demands, damages, losses, liabilities,
     obligations, penalties, litigation, defenses, judgments, decrees,
     orders, directives, suits, actions, proceedings, costs and expenses
     (including, without limitation, reasonable counsel fees and expenses
     and reasonable experts' fees and expenses) of any kind or nature
     whatsoever which may at any time be imposed upon, paid or incurred by
     or asserted or awarded against any of them relating to, resulting from
     or arising out of (i) the presence, manufacture, generation,
     production, processing, use, handling, treatment, storage, disposal,
     transportation or distribution on or about any Obligor Use Property of
     any Hazardous Substance, (ii) any Hazardous Substance Contamination,
     (iii) any non-compliance with any applicable Environmental Law by the
     Borrower, any of its Subsidiaries or any of the Guarantors, any
     Obligor Use Property or any operations previously, now or hereafter
     conducted on any Obligor Use Property, or (iv) any costs associated
     with any remedial or curative action relating to any Hazardous
     Substances, any Hazardous Substance Contamination or any violation of
     any applicable Environmental Laws; provided that nothing contained in
                                        --------
     this Subsection shall be deemed to preclude the Borrower, any of its
     Subsidiaries or any of the Guarantors  from joining as a potentially
     responsible party any group convened for the remediation or cure of
     any site and proposing that the Borrower's obligations under this
     Subsection be alternatively satisfied by prudent action taken in
     concert with such group; and provided further that nothing contained
                                  -------- -------
     in this Subsection shall obligate the Borrower to indemnify, protect
     or defend any of the Agent, the Lenders or the Issuing Bank, or any of
     their officers, directors, employees, attorneys or agents, or to save
     harmless any of the Agent, the Lenders or the Issuing Bank, or any of
     their officers, directors, employees, attorneys or agents, from or
     against any claims, demands, damages, losses, liabilities,
     obligations, penalties, litigation, defenses, judgments, decrees,
     orders, directives, suits, actions, proceedings, costs or expenses
     resulting from or arising out of any act of the Person, or any
     officer, director, employee, attorney or agent of the Person,
     otherwise entitled to be indemnified.  The indemnification obligations
     of the Borrower under this Subsection shall survive the termination of
     this Agreement and payment of the outstanding Notes for a period of
     two (2) years.






















     
<PAGE>

<PAGE>
     

               6.9  Subsidiary Documents.  In the case of each Subsidiary
                    --------------------
     of the Borrower formed or acquired after the date of this Agreement: 
     (a) cause such Subsidiary to duly execute and deliver to the Agent,
     appropriately completed in each case (i) a Subsidiary Guaranty and
     (ii) a Subsidiary Security Agreement; (b) duly execute and deliver to
     the Agent, and cause such Subsidiary to duly execute and deliver to
     the Agent, such financing statements as may be required by the
     Required Lenders; (c) duly execute and deliver to the Agent, and cause
     other Persons to duly execute and deliver to the Agent, such
     additional Credit Documents as the Required Lenders may require in
     good faith in order to assure to the Agent, the Lenders and the
     Issuing Bank their rights and interests under this Agreement and the
     other Credit Documents; (d) deliver to the Agent evidence satisfactory
     to the Required Lenders that all agreements, instruments and documents
     executed and delivered to the Agent pursuant to this Subsection have
     been duly authorized, executed and delivered; and (e) do, make,
     execute, deliver, and cause such Subsidiary to do, make, execute and
     deliver, all such additional and further acts, things, deeds,
     assurances, instruments and documents as the Required Lenders may
     request in good faith to vest and assure to the Agent, the Lenders and
     the Issuing Bank their rights and interests under this Agreement.

               6.10 Facility Fee.  On the first anniversary of the date of
                    ------------
     this Agreement or the Termination Date, whichever is earlier, pay to
     the Agent, for the ratable benefit of the Lenders as of the date
     hereof according to their Commitment Percentages, a facility fee equal
     to Fifty Thousand Dollars ($50,000.00).

               6.11 Real Property Surveys.  Within sixty (60) days after
                    ---------------------
     the date of this Agreement, deliver to the Agent, in form and content
     satisfactory to the Agent, surveys of the Real Property Collateral,
     with surveyors' certificates, sufficient to induce the title insurance
     company insuring the Deed of Trust to remove any survey exceptions
     from the title insurance policy without adding any additional
     exceptions based upon such surveys.

               6.12 Transit Investment.   Commencing March 15, 1995, cause
                    ------------------
     the UIC-DEL Standby Subordinated Debt Balance arising on account of
     loans or advances made to the Borrower by UIC-DEL, exclusive of the
     Indebtedness evidenced by the Creditor Note (as defined in the UIC-DEL
     Subordination Agreement), at all times to equal, at least, the
     aggregate amount of the Transit Investments made by the Borrower, its
     Subsidiaries, Symtron and Other Obligors.



























     
<PAGE>

<PAGE>
     

               SECTION 7.  NEGATIVE COVENANTS

               The Borrower hereby covenants and agrees that, so long as
     the Commitments remain in effect, any Note or L/C Reimbursement
     Obligation remains outstanding and unpaid, any Letter of Credit
     remains outstanding  or any amount is owing to any Lender, the Agent
     or the Issuing Bank hereunder or under any other of the Credit
     Documents, the Borrower shall not, directly or indirectly:

               7.1  Financial Condition Covenants.
                    -----------------------------
                    (a)  Maintenance of Capital Base.  Permit Capital Base
                         ---------------------------
     to be less than the amounts indicated below at any time during the
     periods indicated below:

                    Period                     Capital Base Amount
                    ------                     -------------------
                    12/31/94 through 3/30/95   $66,000,000.01

                    3/31/95* through 6/29/95   $66,500,000.01

                    6/30/95* through 9/29/95   $67,000,000.01

                    9/30/95* through 12/30/95  $67,500,000.01

                    12/31/95 through 3/30/96   $68,400,000.01

                    3/31/96* through 6/29/96   $68,900,000.01

                    6/30/96* through 9/29/96   $69,400,000.01

                    9/30/96* through 12/30/96  $69,900,000.01

                    12/31/96 and thereafter    $70,800,000.01

                    *In the case of the $500,000.00 increases in the
     required amount of Capital Base becoming effective on 3/31/95,
     6/30/95, 9/30/95, 3/31/96, 6/30/96 and 9/30/96, notwithstanding any
     other provision of this Agreement, it shall not constitute an Event of
     Default until and unless the Borrower shall fail to achieve any of
     such $500,000.00 increases by the end of the succeeding quarterly
     accounting period of the Borrower.  For example, if the Borrower
     maintains Capital Base at least equal to $66,000,000.01 but less






























     
<PAGE>

<PAGE>
     

     than $66,500,000.01 during the period 3/31/95 through 6/29/95, no
     Event of Default on account thereof shall occur until and unless the
     Borrower does not achieve Capital Base at least equal to
     $66,500,000.01 on 6/30/95.

                    (b)  Leverage Ratio.  Permit Leverage Ratio to be
                         --------------
     greater than 1.25 to 1.00 as at any time from the date of this
     Agreement through August 31, 1995; or permit Leverage Ratio to be
     greater than 1.15 to 1.00 as at any time after August 31, 1995.

                    (c)  Cash Flow Coverage Ratio.  As at the end of the
                         ------------------------
     quarterly accounting periods of the Borrower ending on the dates
     indicated below, permit Cash Flow Coverage Ratio for the four (4)
     consecutive quarterly accounting periods of the Borrower then ending
     to be less than the ratio indicated:

                    Quarter End                Ratio
                    -----------                -----
                    12/31/94                   2.00 to 1.00

                    3/31/95                    2.00 to 1.00

                    6/30/95                    1.80 to 1.00

                    9/30/95 and each quarter   .90 to 1.00*
                    end thereafter

                    *This ratio shall be increased to 1.80 to 1.00 upon
     payment in full of the Private Placement Debt.

                    (d)  Capital Expenditures.  Permit Capital Expenditures
                         --------------------
     in any fiscal year of the Borrower to exceed Three Million Dollars
     ($3,000,000.00).

               7.2  Limitation on Indebtedness.  Create, incur, assume or
                    --------------------------
     suffer to exist any Indebtedness, or suffer or permit any of its
     Subsidiaries or Symtron to create, incur, assume or suffer to exist
     any Indebtedness, except:

                    (a)  Indebtedness of the Borrower, any of its
     Subsidiaries or Symtron under this Agreement and the other Credit
     Documents;




























     
<PAGE>

<PAGE>
     

                    (b)  Indebtedness of the Borrower, any of its
     Subsidiaries or Symtron in connection with trade accounts payable,
     payroll related costs, taxes, insurance premiums and other liabilities
     incurred in the ordinary course of business;

                    (c)  Post-retirement benefits required by FAS 106 and
     FAS 212 of the Financial Accounting Standards Board;

                    (d)  Indebtedness of the Borrower and its Subsidiaries
     and Symtron for advances made to them by their customers in the
     ordinary course of business in connection with contracts between the
     Borrower, any of its Subsidiaries or Symtron and any of their
     customers;

                    (e)  Indebtedness of the Borrower, any of its
     Subsidiaries or Symtron for overpayments made to them by their
     customers in connection with contracts between them and their
     customers;

                    (f)  Indebtedness payable under the existing contracts
     pursuant to which UIC acquired the capital stock of Symtron and the
     Borrower acquired the assets of Technologies; 

                    (g)  Indebtedness of the Borrower to the Private
     Placement Debt Holders under the Private Placement Debt Documents, as
     in effect on the date hereof;

                    (h)  Contingent Indebtedness to Signet Bank/Maryland on
     account of reimbursement obligations and related obligations in
     connection with the Indemnified Letters of Credit;

                    (i)  UIC Subordinated Debt and UIC-DEL Subordinated
     Debt;

                    (j)  Indebtedness subordinated to the Obligations on
     terms and conditions satisfactory to the Agent, the Required Lenders
     and the Issuing Bank;

                    (k)  Indebtedness specifically consented to in writing
     by the Agent;

                    (l)  Indebtedness permitted under Subsection 7.8(c);

                    (m)  Indebtedness of Transit to any Person other than
     the Borrower or any Other Obligor, or Indebtedness of Transit to the
     Borrower or any Other Obligor




























     
<PAGE>

<PAGE>
     

     created and existing without violation of this Agreement or any of the
     other Credit Documents;

                    (n)  Indebtedness of the Borrower, any of its
     Subsidiaries or Symtron on account of any judgment, decree or award
     entered against it, the existence of which does not constitute an
     Event of Default under Subsection 8.1(o);

                    (o)  Existing Indebtedness of Symtron to UIC not
     exceeding, in the aggregate, Five Hundred Thousand Dollars
     ($500,000.00); and

                    (p)  Indebtedness of the Borrower, any of its
     Subsidiaries or Symtron secured by Permitted Equipment PMSIs and other
     Indebtedness of the Borrower, any of its Subsidiaries or Symtron not
     described in clauses (a) through and including (o) above in an
     aggregate amount not to exceed Five Hundred Thousand Dollars
     ($500,000.00).

               7.3  Limitation on Liens.  Create, incur, assume or suffer
                    -------------------
     to exist, or suffer or permit any of its Subsidiaries or Symtron to
     create, incur, assume or suffer to exist, any Lien upon any of its
     property, assets or revenues, whether now owned or hereafter acquired,
     except for the following (each a "Permitted Lien" and, collectively,
     "Permitted Liens"):

                    (a)  Liens for taxes not yet due or which are being
     contested in good faith by appropriate proceedings, provided that
                                                         --------
     adequate reserves with respect thereto are maintained on the books of
     the Borrower or such Subsidiary or Symtron, as the case may be, in
     conformity with GAAP and that no notice of lien with respect thereto
     is filed in any recording office;

                    (b)  carriers', warehousemen's, mechanics',
     materialmen's, repairmen's, landlords', or other like Liens arising in
     the ordinary course of business with respect to obligations which are
     not due or which are being contested in good faith by appropriate
     proceedings in a manner which will not jeopardize or diminish any
     interest of the Agent or the Lenders;

                    (c)  pledges or deposits in connection with workers'
     compensation, unemployment insurance and other social security
     legislation and deposits securing liability to insurance carriers
     under insurance or self-insurance arrangements and otherwise made in
     the ordinary course of business;



























     
<PAGE>

<PAGE>
     

                    (d)  deposits to secure the performance of bids,
     contracts (other than for borrowed money), leases, statutory
     obligations, surety and appeal bonds, performance bonds and other
     obligations of a like nature incurred in the ordinary course of
     business;

                    (e)  easements, rights-of-way, restrictions and other
     similar encumbrances incurred in the ordinary course of business
     which, in the aggregate, are not substantial in amount and which do
     not in any case materially detract from the value of the property
     subject thereto or materially interfere with the ordinary conduct of
     the business of the Borrower or such Subsidiary;

                    (f)  Liens in favor of the Agent created pursuant to
     the Credit Documents;

                    (g)  Permitted Equipment PMSIs permitted under
     Subsection 7.2(p);

                    (h)  Liens in favor of prime contractors and customers
     of the Borrower, its Subsidiaries and Symtron, including Governmental
     Authorities, arising by operation of law (including the FAR and DFAR) 
     as a result of the receipt under a contract of progress-billings in
     the ordinary course of business and encumbering inventory, work-in-
     process or other assets identified or chargeable to such contract;

                    (i)  intellectual property license arrangements entered
     into without violation of any of the provisions of this Agreement or
     any of the other Credit Documents; 

                    (j)  Liens in favor of or for the benefit of the
     Issuing Bank in or upon cash, cash equivalents or other liquid assets
     pledged to the Issuing Bank in connection with, or in or upon bills of
     lading or other shipping or transportation documents, warehouse
     receipts or other documents and writings relating to, and insurance
     and other similar rights arising in connection with, the L/C
     Agreements or the issuance and payment of drawings under Letters of
     Credit;

                    (k)  Liens in favor of or for the benefit of the Agent
     or First Fidelity in or upon cash, cash equivalents, marketable
     securities or other liquid assets and other rights relating to or in
     connection with overnight investments or other investments made or
     managed by First Fidelity for or on behalf of the Borrower, any of its
     Subsidiaries or Symtron;

                    (l)  Liens, if any, described in Schedule 7.3 and
     constituting Permitted Equipment PMSIs permitted under
     Subsection 7.2(g); or

























     
<PAGE>

<PAGE>
     

                    (m)  Liens securing Indebtedness of Transit permitted
     under Subsection 7.2.

               7.4  Limitation on Contingent Obligations.  Create, incur,
                    ------------------------------------
     assume or suffer to exist, or suffer or permit any of its Subsidiaries
     or Symtron to create, incur, assume or suffer to exist, any Contingent
     Obligation except:

                    (a)  Contingent Obligations arising in connection with
     Letters of Credit or otherwise arising under or in connection with the
     Credit Documents;

                    (b)  Contingent Obligations in the nature of
     performance bonds and performance guaranties arising in the ordinary
     course of business, including guaranties by the Borrower, any of its
     Subsidiaries or Symtron of any lease obligations of the Borrower, any
     of its Subsidiaries or Symtron;

                    (c)  Contingent Obligations of the Borrower not
     exceeding at any time Seven Hundred Seventy-Five Thousand Dollars
     ($775,000.00) in connection with a guaranty by the Borrower of
     obligations of Pioneer to The Bank of Baltimore;

                    (d)  Contingent Obligations of the Borrower under that
     certain Guaranty of AAI Corporation dated May 25, 1993, executed and
     delivered by the Borrower for the benefit of Federal Laboratories,
     Inc., a Delaware corporation;

                    (e)  Contingent Obligations incurred or assumed by
     Transit;

                    (f)  Contingent Obligations to Signet Bank/Maryland on
     account of reimbursement obligations and related obligations in
     connection with the Indemnified Letters of Credit; and

                    (g)  Contingent Obligations to Transit incurred or
     assumed by the Borrower pursuant to the Electric Transit, Inc., Stock
     Subscription and Stockholders' Agreement dated as of February 18,
     1994.

               7.5  Limitations on Fundamental Changes.  Enter into, or
                    ----------------------------------
     suffer or permit any of its Subsidiaries or Symtron to enter into, any
     merger, consolidation, amalgamation or share exchange, or suffer or
     permit any business, assets, operations or books and records of the
     Borrower or any of its Subsidiaries or Symtron to be merged,
     consolidated or commingled with any business, assets, operations or
     books and records of any other Person, or make any material change in
     the present method of conducting business; provided that
                                                --------























     
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<PAGE>
     

     nothing contained in this Subsection shall be deemed to prohibit the
     transfer by the Borrower and Systems to Symtron of the firefighter
     trainer systems business and related contracts, intellectual property
     and other assets.

               7.6  Limitation on Acquisitions.  Purchase or otherwise
                    --------------------------
     acquire, or suffer or permit any of its Subsidiaries or Symtron to
     purchase or otherwise acquire, all or substantially all of the assets
     of any other Person, or any assets of any other Person in a
     transaction which is subject to the Bulk Transfers Title of the
     Uniform Commercial Code of any jurisdiction.

               7.7  Limitation on Sale of Assets.  Convey, sell, assign,
                    ----------------------------
     transfer, lease or otherwise dispose of, or suffer or permit any of
     its Subsidiaries or Symtron to convey, sell, assign, transfer, lease
     or otherwise dispose of, any of its property, business or assets,
     whether now owned or hereafter acquired except:

                    (a)  obsolete or worn-out equipment or other property
     or assets disposed of in the ordinary course of business in exchange
     for, at least, the fair market value thereof, and equipment or other
     property or assets no longer necessary in the conduct of its business
     disposed of in exchange for, at least, the fair market value thereof,
     provided that this clause (a) shall not constitute such a consent or
     --------
     authorization to any such disposition as would authorize the
     disposition free of any Lien of the Agent and all such dispositions
     shall be made subject to all Liens of the Agent except as otherwise
     agreed by the Agent in writing;

                    (b)  the sale or lease of inventory in the ordinary
     course of business;

                    (c)  the sale of the Industry Lane Real Property
     Proposed To Be Sold, provided that net cash proceeds of such sale in
                          --------
     an amount not less than Four Million Seven Hundred Fifty Thousand
     Dollars ($4,750,000.00) are paid to the Agent in immediately available
     funds for application on account of the Obligations and/or the Private
     Placement Debt in accordance with the provisions of the Intercreditor
     Agreement;

                    (d)  the sale of the York Road Real Property Proposed
     To Be Sold, provided that net cash proceeds of such sale in an amount
                 --------
     not less than One Million Three Hundred Thousand Dollars
     ($1,300,000.00) are paid to the Agent in immediately available funds
     for application on account of the Obligations and/or the Private
     Placement Debt in accordance with the provisions of the Intercreditor
     Agreement; 






















     
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                    (e)  the transfer by the Borrower and Systems to
     Symtron of the firefighter trainer systems business and related
     contracts, intellectual property and other assets;

                    (f)  the transfer by the Borrower to IMAX Corporation
     or Ridefilm Corporation, or any of their successors or assigns, of
     assets of the Borrower's Entertainment Business in connection with the
     sale of the Borrower's Entertainment Business; or

                    (g)  the transfer to Reflectone, Inc., or its
     successors or assign, of existing assets or liabilities of Microflite.

               7.8  Limitation on Restricted Payments.  Make or commit to
                    ---------------------------------
     make, or suffer or permit any of its Subsidiaries or Symtron to make
     or commit to make, any Restricted Payments except:

                    (a)  if no Default or Event of Default has occurred and
     is continuing or will result from such Restricted Payment, and if no
     violation of the UIC Subordination Agreement or the UIC-DEL
     Subordination Agreement will result from such Restricted Payment,
     (i) payments of interest on account of the UIC Subordinated Debt and
     the UIC-DEL Subordinated Debt, (ii) payments of principal on account
     of the UIC-DEL Subordinated Debt, other than the UIC-DEL Standby
     Subordinated Debt, and (iii) payments of principal on account of the
     UIC Subordinated Debt, provided that all such Restricted Payments are
                            --------
     used by UIC or UIC-DEL, as the case may be, to pay dividends, to
     purchase common stock of UIC to be held by UIC as treasury stock (in
     the case of such Restricted Payments made to UIC), to make loans to
     UIC (in the case of such Restricted Payments made to UIC-DEL), to make
     loans to the Borrower, to pay taxes, Indebtedness to third parties
     incurred in the ordinary course of business, judgments and awards with
     respect to Indebtedness or other obligations incurred in the ordinary
     course of business, compensation to directors, officers, employees and
     independent contractors in the ordinary course of business, expenses
     incurred by Subsidiaries of UIC in the ordinary course of business or
     other expenses incurred in the ordinary course of business acceptable
     to the Required Lenders, in their discretion reasonably exercised,
     and, to the extent of an amount not exceeding One Million Five Hundred
     Thousand Dollars ($1,500,000.00), to make loans or capital
     contributions to Subsidiaries of UIC (other than the Borrower), to
     fund acquisitions of assets or Investments or to fund Capital
     Expenditures not prohibited by this Agreement;

                    (b)  payments or other transfers to the Borrower by any
     Affiliate of the Borrower; 



























     
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                    (c)  loans or capital contributions by the Borrower to
     any Eligible Affiliate, the proceeds of which loans or capital
     contributions shall be used by such Eligible Affiliate to finance the
     carry of accounts, the purchase of inventory, the funding of Capital
     Expenditures not prohibited by this Agreement and other ordinary
     course of business activities;

                    (d)  payment of compensation and reimbursement of
     expenses to employees of the Borrower or any Eligible Affiliate in the
     ordinary course of business;

                    (e)  payments in consideration of purchases of
     equipment or other property or assets disposed of pursuant to and in
     accordance with Subsection 7.7(a);

                    (f)  payments in consideration of purchases of
     inventory in the ordinary course of business in accordance with
     Subsection 7.9; 

                    (g)  payments in consideration of purchases of products
     or services in accordance with Subsection 7.9;

                    (h)  payments in consideration of the lease or sublease
     of any property at fair market rates in accordance with
     Subsection 7.9;

                    (i)  payments to UIC in reimbursement of expenses of
     the Borrower, any of its Subsidiaries or Symtron paid by UIC on its
     behalf;

                    (j)  payments of fees to UIC by the Borrower, any of
     its Subsidiaries, Symtron and UIC-DEL not exceeding in any fiscal year
     of the Borrower, any of its Subsidiaries, Symtron or UIC-DEL, as the
     case may be, one percent (1%) of its gross sales for such fiscal year;

                    (k)  payments under the existing contract pursuant to
     which the capital stock of Symtron was acquired by UIC;

                    (l)  payments or other transfers by Transit to any
     Affiliate of Transit; and

                    (m)  payments by Symtron to UIC in satisfaction of the
     existing Indebtedness of Symtron to UIC not exceeding, in the
     aggregate, Five Hundred Thousand Dollars ($500,000.00) referred to in
     Subsection 7.2(m).





























     
<PAGE>

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               7.9  Limitation on Transactions with Affiliates.  Enter
                    ------------------------------------------
     into, or suffer or permit any of its Subsidiaries (other than Transit)
     or Symtron to enter into, any transaction with any Affiliate except
     for transactions with Affiliates entered into in the ordinary course
     of business on terms no less favorable than would apply in a
     comparable arm's-length transaction with a Person that is not an
     Affiliate.

               7.10 Limitation on Subsidiaries.  Form or acquire, or suffer
                    --------------------------
     or permit any of its Subsidiaries (other than Transit) or Symtron to
     form or acquire, any Subsidiary.

               7.11 Limitation on Investments, Loans and Advances.  Give
                    ---------------------------------------------
     any value for any Investment or make any advance, loan or extension of
     credit to any Person, or suffer or permit any of its Subsidiaries or
     Symtron to give any value for any Investment or make any advance, loan
     or extension of credit to any Person, except:

                    (a)  extensions of trade credit in the ordinary course
     of business and advances to suppliers and vendors in the ordinary
     course of business;

                    (b)  Investments in Cash Equivalents;

                    (c)  loans to officers or employees of the Borrower,
     any of its Subsidiaries (other than Transit) or Symtron not exceeding,
     in the case of any single officer or employee, an aggregate amount of
     One Hundred Thousand Dollars ($100,000.00) at any time outstanding and
     not exceeding, in the case of all such loans to all such officers and
     employees, an aggregate amount of Five Hundred Thousand Dollars
     ($500,000.00) at any time outstanding;

                    (d)  existing loans (not including any additional
     advances) by the Borrower to Pioneer not exceeding Three Hundred
     Sixty-One Thousand Dollars ($361,000.00);

                    (e)  any Transit Investment, provided that (i) the
                                                 --------
     aggregate amount of all Transit Investments made by the Borrower, its
     Subsidiaries, Symtron and Other Obligors shall not at any time exceed
     Four Million Dollars ($4,000,000.00), (ii) the aggregate amount of all
     Transit Investments made by the Borrower, its Subsidiaries, Symtron
     and Other Obligors shall not at any time on or after March 15, 1995,
     exceed the UIC-DEL Standby Subordinated Debt Balance arising on
     account of loans or advances made to the Borrower by UIC-DEL,
     exclusive of the Indebtedness evidenced by the Creditor Note (as
     defined in the UIC-DEL Subordination Agreement), and (iii) the Agent
     shall have been granted a perfected first priority security interest
     in all Indebtedness and other obligations of






















     
<PAGE>

<PAGE>
     

     Transit or any other Person to the Borrower, any of its Subsidiaries
     or any of the Guarantors (other than UIC) in connection with any such
     Transit Investment; and

                    (f)  other Investments specifically permitted by other
     provisions of this Agreement.

               7.12 Limitation on Optional Payments and Modifications.  (a)
                    -------------------------------------------------
     Make, or suffer or permit any of its Subsidiaries (other than Transit)
     or Symtron to make, any optional payment or prepayment on or
     redemption of any Indebtedness (other than Indebtedness pursuant to
     this Agreement), (b) amend, modify or change, or consent or agree to
     any amendment, modification or change to, any of the terms of any
     Indebtedness (other than any such amendment, modification or change
     which would extend the maturity or reduce the amount of any payment of
     principal thereof or which would reduce the rate or extend the date
     for payment of interest thereon), or (c) amend any of the terms or
     provisions of any of the Private Placement Debt Documents, any of the
     Indemnified Letters of Credit or any documents or instruments
     evidencing, guaranteeing, securing or otherwise relating to the UIC
     Subordinated Debt or the UIC-DEL Subordinated Debt.

               7.13 Limitation on Sale and Leaseback.  Enter into, or
                    --------------------------------
     suffer or permit any of its Subsidiaries (other than Transit) or
     Symtron to enter into, any arrangement with any Person providing for
     the leasing by the Borrower or such Subsidiary or Symtron of real or
     personal property which has been or is to be sold or transferred by
     the Borrower or such Subsidiary or Symtron to such Person or to any
     other Person to whom funds have been or are to be advanced by such
     Person on the security of such property or rental obligations of the
     Borrower or such Subsidiary or Symtron.

               7.14 Fiscal Year.  Permit the fiscal year of the Borrower to
                    -----------
     end on a day other than December 31.

               7.15 Places of Business.  Change, or suffer or permit to be
                    ------------------
     changed, the location of the Borrower Chief Executive Office or the
     chief executive office of any Subsidiary of the Borrower, Symtron or
     any Guarantor, or the location of any of their books and records, to
     any location outside the United States of America or, unless the Agent
     shall have received ninety (90) days prior written notice of the
     change, to any location within the United States of America; or have
     or maintain, other than the Borrower Business Premises, any business,
     office or storage location, or suffer or permit any Subsidiary of the
     Borrower (other than Transit) or Symtron to have or maintain any new
     business, office or storage location, unless the Agent shall have
     received ninety (90) days prior written notice of the new location.























     
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               7.16 Change of Name.  Change, or suffer or permit to be
                    --------------
     changed, the name of the Borrower or any of its Subsidiaries (other
     than Transit) or Symtron, or use any trade name, or permit any of its
     Subsidiaries (other than Transit) or Symtron to use any trade name,
     other than its true corporate name, unless the Agent shall have
     received ninety (90) days prior written notice of such change or use.

               7.17 Compliance with ERISA.  (a)  Terminate or permit to be
                    ---------------------
     terminated any Plan so as to result in any material liability to the
     PBGC, (b) engage in, or suffer or permit any Other Obligor to engage
     in, any "prohibited transaction" (as defined in Section 4975 of the
     Code) involving any Plan which would result in a material liability of
     the Borrower or any Other Obligor for an excise tax or civil penalty
     in connection therewith, (c) incur or suffer to exist, or suffer or
     permit any Other Obligor to incur or suffer to exist, any material
     "accumulated funding deficiency" (as defined in section 302 of ERISA),
     whether or not waived, involving any Plan which would materially
     increase the amounts required to be contributed to such Plan by the
     Borrower or any Other Obligor, or (d) allow or suffer to exist any
     event or condition which presents a material risk of the Borrower or
     any Other Obligor incurring a material liability to the PBGC by reason
     of termination of any Plan.  The Agent, the Lenders and the Issuing
     Bank acknowledge that the Borrower has informed them that the Borrower
     is planning a change in a Plan which will include freezing earned
     benefits under the Plan as now in effect and the introduction of a
     cash balance plan supplemented by direct contributions by the
     Borrower, matching 401(k) contributions by the Borrower and a profit
     sharing feature, and the Borrower acknowledges that it has informed
     the Agent, the Lenders and the Issuing Bank that such change will be
     effected in accordance with all requirements of ERISA and other
     Requirements of Law.

               7.18 Environmental.  Except as set forth in Schedule 4.13,
                    -------------
     permit any Hazardous Substance to be present, manufactured, generated,
     produced, processed, used, handled, treated, stored or disposed of on
     any Obligor Use Property in violation of any applicable Environmental
     Law which could reasonably be expected to have a Material Adverse
     Effect or result in the imposition of a Lien upon any of the property,
     assets or revenues of the Borrower, any of its Subsidiaries or any
     Other Obligor or exposure of the Borrower, any of its Subsidiaries or
     any Other Obligor to potential liability, whether for the cost of cure
     or remediation or otherwise, in excess of One Hundred Thousand Dollars
     ($100,000.00); permit to occur any Hazardous Substance Contamination
     which could reasonably be expected to have a Material Adverse Effect
     or result in the imposition of a Lien upon any of the property, assets
     or revenues of the Borrower, any of its Subsidiaries or any Other
     Obligor or exposure of the Borrower, any of its Subsidiaries or any
     Other Obligor to potential liability, whether for the cost of cure or
     remediation or otherwise, in excess of One Hundred Thousand Dollars
     ($100,000.00); or, except for underground storage tanks





















     
<PAGE>

<PAGE>
     

     identified in Schedule 4.13, permit any underground storage tanks to
     be located on any Obligor Use Property.

               7.19 Limitation on Negative Pledge Clauses.  Enter into, or
                    -------------------------------------
     suffer or permit any of its Subsidiaries (other than Transit) or
     Symtron to enter into, any agreement, other than pursuant to this
     Agreement or the other Credit Documents, any industrial revenue bonds,
     purchase money mortgages, Financing Leases or Permitted Equipment
     PMSIs permitted by this Agreement (in which cases, any prohibition or
     limitation shall only be effective against the assets financed
     thereby), with any Person which prohibits or limits the ability of the
     Borrower or such Subsidiary (other than Transit) or Symtron to create,
     incur, assume or suffer to exist any Lien upon any of its property,
     assets or revenues, whether now owned or hereafter acquired.

               7.20 Limitation on Inconsistent Agreements.  Enter into, or
                    -------------------------------------
     suffer or permit any of its Subsidiaries (other than Transit) or any
     Other Obligor to enter into, any agreement which is inconsistent with
     any obligations of the Borrower, any of its Subsidiaries or any Other
     Obligor under this Agreement or any of the other Credit Documents.


               SECTION 8.  EVENTS OF DEFAULT

               8.1  Events of Default.
                    -----------------
                    Upon and at any time after the occurrence of any of the
     following events:

                    (a)  The Borrower or any Other Obligor shall fail to
     pay any amount due to the Agent, any Lender or the Issuing Bank,
     including, without limitation, principal and interest on the Notes,
     L/C Reimbursement Obligations, fees or expenses; or

                    (b)  Any representation or warranty made or deemed made
     by the Borrower or any Other Obligor herein or in the other Credit
     Documents or which is contained in any certificate, document or
     financial or other statement furnished at any time under or in
     connection with this Agreement or any such other Credit Document shall
     prove to have been incorrect in any material respect on or as of the
     date made or deemed made; or

                    (c)  The Borrower shall default in the observance or
     performance of any agreement contained in Section 7, or the Borrower
     or any Other Obligor shall default in the observance or performance of
     any negative covenant of the Borrower or such Other


























     
<PAGE>

<PAGE>
     

     Obligor contained in any of the other Credit Documents, or the
     Borrower shall default in the observance or performance of any of the
     agreements of the Borrower contained in Subsection 6.1 or
     Subsection 6.4(b); or

                    (d)  The Borrower or any Other Obligor shall default in
     the observance or performance of any other agreement contained in this
     Agreement or any of the other Credit Documents (other than as provided
     in (a) through (c) above) and such default shall continue unremedied
     for a period of fifteen (15) days; or

                    (e)  (i) This Agreement or any of the other Credit
     Documents shall be, or shall be held by a court of competent
     jurisdiction to be, invalid or unenforceable in any respect deemed
     material by the Required Lenders or, in the case of any provision of
     Section 3 of this Agreement or any provision of any L/C Agreement, by
     the Issuing Bank, (ii) the Intercreditor Agreement shall be, or shall
     be held by a court of competent jurisdiction to be, invalid or
     unenforceable in any respect deemed material by the Required Lenders
     or the Issuing Bank, or (iii) the security interests and other Liens
     created in favor of or for the benefit of the Agent, the Lenders or
     the Issuing Bank shall cease to be enforceable and of the same effect
     and priority purported to be created thereby; or

                    (f)  The Borrower or any Other Obligor shall revoke or
     terminate, or attempt to revoke or terminate, or notify the Agent, any
     Lender or the Issuing Bank of revocation or termination of, any
     continuing obligations or agreements of the Borrower or such Other
     Obligor relating in any way to this Agreement or any of the other
     Credit Documents; or

                    (g)  The Borrower or any Other Obligor shall (i)
     default in any payment of any Indebtedness (other than Indebtedness
     referred to in paragraph (a) above) or in the payment of any
     Contingent Obligation exceeding Two Hundred Fifty Thousand Dollars
     ($250,000.00) in the aggregate, beyond any period of grace but whether
     or not any required notice has been given; or (ii) default in the
     observance or performance of any other agreement or condition
     otherwise relating to any such Indebtedness or Contingent Obligation
     or contained in any instrument or agreement evidencing, securing or
     otherwise relating thereto, or any other event shall occur or
     condition exist, the effect of which default or other event or
     condition is to cause, or to permit the holder or holders of such
     Indebtedness or beneficiary or beneficiaries of such Contingent
     Obligation (or a trustee or agent on behalf of such holder or holders
     or beneficiary or beneficiaries) to cause, with the giving of notice
     if required, such Indebtedness to become due prior to its stated
     maturity or such Contingent Obligation to become payable; provided
                                                               --------
     that nothing contained in this clause (g) shall be construed to
     require the Borrower or any Other Obligor to refrain from contesting
     the






















     
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<PAGE>
     

     validity, enforceability, amount or maturity of any alleged
     Indebtedness or Contingent Obligation or any agreement or condition
     relating thereto, or the existence of any default with respect
     thereto; or

                    (h)  (i) The Borrower or any Other Obligor shall
     commence any case, proceeding or other action (A) under any existing
     or future law of any jurisdiction, domestic or foreign, relating to
     bankruptcy, insolvency, reorganization or relief of debtors, seeking
     to have an order for relief entered with respect to it, or seeking to
     adjudicate it a bankrupt or insolvent, or seeking reorganization,
     arrangement, adjustment, winding-up, liquidation, dissolution,
     composition or other relief with respect to it or its debts, or (B)
     seeking appointment of a receiver, trustee, custodian or other similar
     official for it or for all or any substantial part of its assets, or
     the Borrower or any Other Obligor shall make a general assignment for
     the benefit of its creditors, whether or not any court assumes
     jurisdiction thereof; or (ii) there shall be commenced against the
     Borrower or any Other Obligor any case, proceeding or other action of
     a nature referred to in clause (i) above which (A) results in the
     entry of an order for relief or any such adjudication or appointment
     or (B) remains undismissed, undischarged or unbonded for a period of
     sixty (60) days; or (iii) there shall be commenced against the
     Borrower or any Other Obligor any case, proceeding or other action
     seeking issuance of a warrant of attachment, execution, distraint or
     similar process against all or any substantial part of its assets
     which results in the entry of an order for any such relief which shall
     not have been vacated, discharged, or stayed or bonded pending appeal,
     within sixty (60) days from the entry thereof; or (iv) the Borrower or
     any Other Obligor shall take any action in furtherance of, or
     indicating its consent to, approval of, or acquiescence in, any of the
     acts set forth in clause (i), (ii) or (iii) above; or (v) the Borrower
     or any Other Obligor shall be insolvent (as defined in Section 101(32)
     of the United States Bankruptcy Code, or any successor legislation),
     or generally not, or shall be unable to, or shall admit in writing its
     inability to, pay its debts as they become due; or

                    (i)  Dissolution or liquidation of, or the entry of any
     unstayed judgment, order, award or decree for the dissolution or
     liquidation of, the Borrower or any Other Obligor; or

                    (j)  Injunction or restraint of the Borrower or any
     Other Obligor in any manner from conducting its business in whole or
     in part deemed material by the Required Lenders in good faith; or

                    (k)  Any assets of the Borrower, any Subsidiary of the
     Borrower or any Other Obligor which are determined by the Required
     Lenders in good faith to be material shall be attached, levied upon,
     seized or repossessed; or

























     
<PAGE>

<PAGE>
     

                    (l)  There shall occur any event or condition which the
     Required Lenders reasonably determine has a material adverse effect on
     the business or prospects of the Borrower, whether or not such event
     or condition otherwise constitutes an Event of Default, provided that
                                                             --------
     the failure of Transit to be awarded a contract by the Miami Valley
     Transit Authority for the supply of electric trolley buses shall not
     be deemed to have a material adverse effect on the business or
     prospects of the Borrower; or 

                    (m)  The occurrence of any event which, in the judgment
     of the Required Lenders exercised reasonably, materially impairs the
     financial condition of the Borrower or any Other Obligor; or

                    (n)  (i) Any Person shall engage in any "prohibited
     transaction" (as defined in Section 406 of ERISA or Section 4975 of
     the Code) involving any Plan, (ii) any "accumulated funding
     deficiency" (as defined in Section 302 of ERISA), whether or not
     waived, shall exist with respect to any Plan which would materially
     increase the amounts required to be contributed to such Plan by the
     Borrower or any Other Obligor, (iii) a Reportable Event shall occur
     with respect to, or proceedings shall commence to have a trustee
     appointed, or a trustee shall be appointed, to administer or to
     terminate, any Single Employer Plan, which Reportable Event or
     commencement of proceedings or appointment of a trustee is, in the
     judgment of the Required Lenders exercised in good faith, likely to
     result in the termination of such Plan for purposes of Title IV of
     ERISA, (iv) any Single Employer Plan shall terminate for purposes of
     Title IV of ERISA, (v) the Borrower or any Commonly Controlled Entity
     shall, or in the judgment of the Required Lenders exercised in good
     faith is likely to, incur any liability in connection with a
     withdrawal from, or the Insolvency or Reorganization of, a
     Multiemployer Plan, or (vi) any other event or condition shall occur
     or exist, with respect to a Plan; and in each case in clauses (i)
     through (vi) above, such event or condition, together with all other
     such events or conditions, if any, could reasonably be expected to
     subject the Borrower or any Other Obligor to any tax, penalty or other
     liabilities in the aggregate material, in the judgment of the Required
     Lenders exercised in good faith, in relation to the business,
     operations, property or financial or other condition of the Borrower,
     provided that the termination of the Symtron Systems, Inc. Employee
     --------
     Savings and Retirement Plan shall constitute an Event of Default only
     if such termination could reasonably be expected, in the judgment of
     the Required Lenders exercised in good faith, to subject the Borrower,
     Symtron or any Other Obligor to any liability in excess of Two Hundred
     Fifty Thousand Dollars ($250,000.00); or

                    (o)  One or more judgments or decrees shall be entered
     against the Borrower or any Other Obligor involving in the aggregate a
     liability (not paid or fully covered by insurance) of Two Hundred
     Fifty Thousand Dollars ($250,000.00) or more and






















     
<PAGE>

<PAGE>
     

     all such judgments or decrees shall not have been vacated, discharged,
     paid, stayed or dismissed within thirty (30) days from the entry
     thereof or, if stayed, shall not have been vacated, discharged, paid
     or dismissed within thirty (30) days after termination of such stay;
     or

                    (p)  UIC shall not legally and beneficially own all of
     the issued and outstanding capital stock of the Borrower and UIC-DEL,
     or UIC or the Borrower shall not legally and beneficially own all of
     the issued and outstanding capital stock of Symtron, in each case,
     with the discretionary power and right to exercise all rights and
     privileges, including voting rights, with respect to such capital
     stock and, more particularly, to elect all of the members of the Board
     of Directors of each thereof and to approve any action of each
     thereof, including extraordinary actions, required to be approved by
     stockholders thereof; or

                    (q)  AAI shall not legally and beneficially own all of
     the issued and outstanding capital stock of each of Systems,
     Technologies, Engineering, Carshell, International, Microflite,
     Medical and Seti, with the discretionary power and right to exercise
     all rights and privileges, including voting rights, with respect
     thereto and, more particularly, to elect all of the members of the
     Board of Directors of each thereof and to approve any action of each
     thereof, including extraordinary actions, required to be approved by
     stockholders of each thereof; or

                    (r)  AAI shall not legally and beneficially own at
     least fifty-three percent (53%) of the issued and outstanding capital
     stock of Transit, with the discretionary power and right to exercise
     all rights and privileges, including voting rights, with respect
     thereto and, more particularly, to elect sixty percent (60%) of the
     members of the Board of Directors of Transit; or

                    (s)  Richard R. Erkeneff shall for any reason cease to
     be, or to perform the functions of, the President and chief executive
     officer of the Borrower, or Paul J. Michaud shall cease to be, or to
     perform the functions of, the chief financial officer of the Borrower,
     unless (i) a replacement President and chief executive officer
     satisfactory to the Required Lenders or a replacement chief financial
     officer satisfactory to the Required Lenders, as the case may be,
     shall have been employed by the Borrower within ninety (90) days
     thereafter, or (ii) a management plan satisfactory to the Required
     Lenders shall have been presented to the Agent within ninety (90) days
     thereafter; or

                    (t)  Any of the Private Placement Debt Holders or any
     of their successors, or any assignee of any of the Private Placement
     Debt Holders permitted under Section 6 of the Intercreditor Agreement
     shall sell or assign any interest in any of the Private
























     
<PAGE>

<PAGE>
     

     Placement Debt otherwise than in accordance with Section 6 of the
     Intercreditor Agreement; or

                    (u)  The Borrower, any of its Subsidiaries (other than
     Transit) or any Other Obligor shall be convicted of an offense
     punishable under any domestic or foreign criminal statute or law as a
     felony or by imprisonment or fine in excess of One Hundred Thousand
     Dollars ($100,000.00); or

                    (v)  There shall occur a Change of Control; or

                    (w)  There shall occur any "Event of Default," as
     defined in any of the other Credit Documents; or

                    (x)  There shall occur any "Event of Default," as
     defined in any of the Private Placement Debt Documents, which has not
     been waived in writing by the Private Placement Debt Holders; or

                    (y)  A "Collateral Distribution Period," as defined in
     the Intercreditor Agreement, shall commence; or

                    (z)  UIC shall sell or assign any interest in any of
     the UIC Subordinated Debt, or UIC-DEL shall sell or assign any
     interest in any of the UIC-DEL Subordinated Debt; or

                    (aa) Any proceeding shall be commenced to suspend or
     debar the Borrower, any of its Subsidiaries or any Other Obligor from
     contracting with any Governmental Authority of the United States of
     America and such proceeding shall remain undismissed for a period of
     ninety (90) days; or

                    (bb) The Borrower, any of its Subsidiaries or any Other
     Obligor shall be suspended or debarred from contracting with any
     Governmental Authority of the United States of America, either as a
     result of a final decision of a Governmental Authority of the United
     States of America concerning suspension or debarment or as a result of
     the pendency of any suspension or debarment proceeding;

     then, (A) if such event is an Event of Default specified in
     paragraph (i) or in clause (i) or (ii) of paragraph (h) above
     automatically the Commitments shall immediately terminate and the
     Revolving Credit Loans (with accrued interest thereon) and all other
     amounts owing under this Agreement, the Notes and the other Credit
     Documents shall immediately become due






























     
<PAGE>

<PAGE>
     

     and payable, and (B) if such event is any other Event of Default and
     is continuing, either or both of the following actions may be taken:
     (i) with the consent of the Required Lenders, the Agent may, or upon
     the request of the Required Lenders, the Agent shall, by notice to the
     Borrower, declare the Commitments to be terminated forthwith,
     whereupon the Commitments shall immediately terminate; and (ii) with
     the consent of the Required Lenders, the Agent may, or upon the
     request of the Required Lenders, the Agent shall, by notice to the
     Borrower, declare the Revolving Credit Loans hereunder (with accrued
     interest thereon) and all other amounts owing under this Agreement and
     the other Credit Documents to be due and payable forthwith, whereupon
     the same shall immediately become due and payable. Except as expressly
     provided above in this Section, presentment, demand, protest and all
     other notices of any kind are hereby expressly waived.

               8.2  Confession of Judgment.  The Borrower hereby authorizes
                    ----------------------
     any clerk of court or any attorney-at-law to appear for the Borrower
     before any court, having jurisdiction, within the United States or
     elsewhere, and, after one or more complaints filed, confess judgment
     against the Borrower as of any time after any of the Obligations are
     due (whether by demand, stated maturity, acceleration or otherwise)
     for the unpaid balance of the Obligations, including principal,
     interest, fees, court costs and expenses, together with attorneys'
     fees equal to fifteen percent (15%) of the amount of such Obligations,
     for collection and release of all errors, and without stay of
     execution, and inquisition and extension upon any levy on real estate
     is hereby waived and condemnation agreed to, and the exemption of
     personal property from levy and sale is also hereby expressly waived,
     and no benefit of exemption shall be claimed under any exemption law
     now in force or which may be hereafter adopted.  The foregoing
     authority and power to confess judgment shall not be exhausted by one
     or more exercises of it or by any imperfect exercise of it, shall not
     be extinguished by any judgment entered because of it and may be
     exercised before, during or after sale, liquidation or other
     disposition by the Agent or any other Person of any property directly
     or indirectly securing any of the Obligations or exercise or
     enforcement by the Agent, any Lender, the Issuing Bank or any other
     Person of any other right or remedy with respect to the Obligations. 
     The Borrower agrees that any agreements of the Borrower contained in
     this Agreement or any of the other Credit Documents to pay any costs
     or expenses, including attorneys' fees and expenses, paid or incurred
     by the Agent, any Lender or the Issuing Bank shall not be merged into,
     or otherwise impaired by, any such judgment by confession, but none of
     the Agent, the Lenders and the Issuing Bank shall be entitled to
     recover on account of such costs or expenses any amount in excess of
     the greater of (a) such costs or expenses included in any judgment by
     confession, or (b) such costs or expenses actually paid or incurred by
     the Agent, the Lenders and the Issuing Bank.

























     
<PAGE>

<PAGE>
     

               SECTION 9.  THE AGENT

               9.1  Appointment.  Each Lender and the Issuing Bank each
                    -----------
     hereby irrevocably designates and appoints First Fidelity as its Agent
     under this Agreement and the other Credit Documents, and each such
     Lender and the Issuing Bank each irrevocably authorizes First
     Fidelity, as its Agent, to take such action on its behalf under the
     provisions of this Agreement and the other Credit Documents and to
     exercise such powers and perform such duties as are expressly
     delegated to the Agent by the terms of this Agreement and such other
     Credit Documents, together with such other powers as are reasonably
     incidental thereto.  Notwithstanding any provision to the contrary
     elsewhere in this Agreement or such other Credit Documents, the Agent
     shall not have any duties or responsibilities, except those expressly
     set forth herein and therein, or any fiduciary relationship with any
     Lender or the Issuing Bank, and no implied covenants, functions,
     responsibilities, duties, obligations or liabilities shall be read
     into this Agreement or the other Credit Documents or otherwise exist
     against the Agent.

               9.2  Delegation of Duties.  The Agent may execute any of its
                    --------------------
     duties under this Agreement and the other Credit Documents by or
     through agents or attorneys-in-fact and shall be entitled to advice of
     counsel concerning all matters pertaining to such duties.  The Agent
     shall not be responsible for the negligence or misconduct of any
     agents or attorneys-in-fact selected by it with reasonable care.

               9.3  Exculpatory Provisions.  Neither the Agent nor any of
                    ----------------------
     its officers, directors, employees, agents, attorneys, attorneys-in-
     fact or Affiliates shall be (i) liable for any action lawfully taken
     or omitted to be taken by it or such Person under or in connection
     with this Agreement, the other Credit Documents or the Intercreditor
     Agreement (except for its or such Person's own gross negligence or
     willful misconduct), or (ii) responsible in any manner to any of the
     Lenders or the Issuing Bank for any recitals, statements,
     representations or warranties made by the Borrower or any Other
     Obligor or any officer thereof contained in this Agreement, the other
     Credit Documents or the Intercreditor Agreement or in any certificate,
     report, statement or other document referred to or provided for in, or
     received by the Agent under or in connection with, this Agreement, the
     other Credit Documents or the Intercreditor Agreement or for the
     value, validity, effectiveness, genuineness, enforceability or
     sufficiency of this Agreement, the other Credit Documents or the
     Intercreditor Agreement or for any failure of the Borrower or any
     Other Obligor to perform its obligations hereunder or thereunder.  The
     Agent shall not be under any obligation to any Lender or the Issuing
     Bank to ascertain or to inquire as to the observance or performance of
     any of the agreements contained in, or conditions of, this Agreement,
     any other Credit Document or the






















     
<PAGE>

<PAGE>
     

     Intercreditor Agreement, or to inspect the properties, books or
     records of the Borrower or any Other Obligor.

               9.4  Reliance by Agent.  The Agent shall be entitled to
                    -----------------
     rely, and shall be fully protected in relying, upon any Note, writing,
     resolution, notice, consent, certificate, affidavit, letter,
     cablegram, telegram, telecopy, telex or teletype message, statement,
     order or other document or conversation believed by it to be genuine
     and correct and to have been signed, sent or made by the proper Person
     or Persons, and upon advice and statements of legal counsel
     (including, without limitation, counsel to the Borrower or any Other
     Obligor), independent accountants and other experts selected by the
     Agent.  The Agent may deem and treat the payee of any Note as the
     owner thereof for all purposes unless a written notice of assignment,
     negotiation or transfer thereof shall have been filed with the Agent. 
     The Agent shall be fully justified in failing or refusing to take any
     action under this Agreement, the other Credit Documents or the
     Intercreditor Agreement unless it shall first receive such advice or
     concurrence of such Persons as it deems appropriate or it shall first
     be indemnified to its satisfaction against any and all liability and
     expense which may be incurred by it by reason of taking or continuing
     to take any such action.  The Agent shall in all cases be fully
     protected in acting, or in refraining from acting, under this
     Agreement, the other Credit Documents and the Intercreditor Agreement
     in accordance with a request of any Lender, the Required Lenders, all
     the Lenders or the Issuing Bank, as required by the terms of this
     Agreement, and such request and any action taken or failure to act
     pursuant thereto shall be binding upon all the Lenders, all future
     holders of the Notes and the Issuing Bank.

               9.5  Notice of Default.  The Agent shall not be deemed to
                    -----------------
     have knowledge or notice of the occurrence of any Default or Event of
     Default (other than a Default or Event of Default under
     Subsection 10(a) resulting from a failure of the Borrower to pay when
     due any amount payable to the Agent, whether for its own account or
     for the account of one or more of the Lenders) unless the Agent has
     received notice from a Lender, the Issuing Bank or the Borrower
     referring to this Agreement, describing such Default or Event of
     Default and stating that such notice is a "notice of default".  In the
     event that the Agent receives such a notice, the Agent shall give
     notice thereof to the Lenders and the Issuing Bank.  The Agent shall
     take such action with respect to such Default or Event of Default as
     shall be reasonably directed by the Required Lenders; provided that
                                                           --------
     unless and until the Agent shall have received such directions, the
     Agent may (but shall not be obligated to) take such action, or refrain
     from taking such action, with respect to such Default or Event of
     Default as it shall deem advisable.

               9.6  Non-Reliance on Agent and Other Lenders.  Each of the
                    ---------------------------------------
     Lenders and the Issuing Bank expressly acknowledges that neither the
     Agent nor any of its officers,



















     
<PAGE>

<PAGE>
     

     directors, employees, agents, attorneys, attorneys-in-fact or
     Affiliates has made any representations or warranties to it and that
     no act by the Agent hereafter taken, including any review of the
     affairs of the Borrower or any Other Obligor, shall be deemed to
     constitute any representation or warranty by the Agent to any of the
     Lenders or the Issuing Bank.  Each of the Lenders and the Issuing Bank
     represents to the Agent that it has, independently and without
     reliance upon the Agent or any other of the Lenders or the Issuing
     Bank, and based on such documents and information as it has deemed
     appropriate, made its own appraisal of and investigation into the
     business, operations, property, financial and other condition and
     creditworthiness of the Borrower and the Other Obligors and made its
     own decision to make its Revolving Credit Loans, to issue Letters of
     Credit and to purchase participations in Letters of Credit and enter
     into this Agreement.  Each of the Lenders and the Issuing Bank also
     represents that it will, independently and without reliance upon the
     Agent or any other of the Lenders and the Issuing Bank, and based on
     such documents and information as it shall deem appropriate at the
     time, continue to make its own credit analysis, appraisals and
     decisions in taking or not taking action under this Agreement and the
     other Credit Documents, and to make such investigation as it deems
     necessary to inform itself as to the business, operations, property,
     financial and other condition and creditworthiness of the Borrower and
     the Other Obligors.  Except for notices, reports and other documents
     expressly required to be furnished to the Lenders or the Issuing Bank
     by the Agent hereunder or by the other Credit Documents, the Agent
     shall not have any duty or responsibility to provide any of the
     Lenders or the Issuing Bank with any credit or other information
     concerning the business, operations, property, financial and other
     condition or creditworthiness of the Borrower or any of the Other
     Obligors which may come into the possession of the Agent or any of its
     officers, directors, employees, agents, attorneys, attorneys-in-fact
     or Affiliates.

               9.7  Indemnification.  The Lenders agree to indemnify the
                    ---------------
     Agent in its capacity as such (to the extent not reimbursed by the
     Borrower and without limiting the obligation of the Borrower to do
     so), ratably according to their Commitment Percentages, from and
     against any and all liabilities, obligations, losses, damages,
     penalties, actions, judgments, suits, costs, expenses or disbursements
     of any kind whatsoever which may at any time (including, without
     limitation, at any time following the payment of the Notes) be imposed
     on, incurred by or asserted against the Agent in any way relating to
     or arising out of this Agreement, the other Credit Documents, the
     Intercreditor Agreement or any documents contemplated by or referred
     to herein or therein or the transactions contemplated hereby or
     thereby or any action taken or omitted by the Agent under or in
     connection with any of the foregoing; provided that no Lender shall be
                                           --------
     liable for the payment of any portion of such liabilities,
     obligations, losses, damages, penalties, actions, judgments, suits,
     costs, expenses or disbursements resulting from the Agent's gross
     negligence or willful misconduct.  The




















     
<PAGE>

<PAGE>
     

     agreements in this Subsection shall survive the payment of the Notes
     and all other amounts payable hereunder.

               9.8  Agent in Its Individual Capacity.  The Agent and its
                    --------------------------------
     Affiliates may make loans to, accept deposits from and generally
     engage in any kind of business with the Borrower and the Other
     Obligors as though the Agent were not the Agent hereunder. With
     respect to its Revolving Credit Loans made or renewed by it, any Note
     issued to it and its participations relating to Letters of Credit, the
     Agent shall have the same rights and powers under this Agreement and
     the other Credit Documents as any Lender and may exercise the same as
     though it were not the Agent, and the terms "Lender" and "Lenders"
     shall include the Agent in its individual capacity.

               9.9  Successor Agent.  The Agent may resign as Agent by
                    ---------------
     giving the Lenders, the Issuing Bank and the Borrower at least thirty
     (30) days prior written notice.  If the Agent shall resign as Agent
     under this Agreement, then the Required Lenders shall appoint a
     successor agent for the Lenders, whereupon such successor agent shall
     succeed to the rights, powers and duties of the Agent, and the term
     "Agent" shall mean such successor agent effective upon its
     appointment, and the former Agent's rights, powers and duties as Agent
     shall be terminated, without any other or further act or deed on the
     part of such former Agent or any of the parties to this Agreement or
     any holders of the Notes.  After any retiring Agent's resignation
     hereunder as Agent, the provisions of this Section 9 shall inure to
     its benefit as to any actions taken or omitted to be taken by it while
     it was Agent under this Agreement:

               9.10 Authority to Execute Intercreditor Agreement.  Each
                    --------------------------------------------
     Lender and the Issuing Bank expressly authorizes the Agent to execute
     the Intercreditor Agreement as its Agent.


               SECTION 10.  MISCELLANEOUS

               10.1 Amendments and Waivers.  Neither this Agreement, any
                    ----------------------
     Note or any other Credit Document, nor any terms hereof or thereof may
     be amended, modified, extended, renewed, supplemented, replaced or
     waived except in accordance with the provisions of this Subsection.
     With the written consent of the Required Lenders and, with respect to
     any amendment, modification, extension, renewal, supplement,
     replacement or waiver of any of the provisions of Section 3, with the
     consent of the Issuing Bank, the Agent and the Borrower may, or, in
     the case of L/C Agreements, the Issuing Bank and the Borrower may,
     from time to time enter into written amendments, modifications,
     extensions,























     
<PAGE>

<PAGE>
     

     renewals, supplements, replacements or waivers for the purpose of
     amending, modifying, extending, renewing, supplementing, replacing or
     waiving any provisions of this Agreement or the other Credit Documents
     or changing in any manner the rights of the parties hereunder or
     thereunder or waiving, on such terms and conditions as the Agent may
     specify in such instrument, any of the requirements of this Agreement
     or the other Credit Documents or any Default or Event of Default and
     its consequences; provided, that no such waiver and no such amendment,
                       --------
     modification, extension, renewal, supplement or replacement shall
     (a) extend the maturity of any payment due hereunder or under any of
     the other Credit Documents, (b) reduce the rate of interest on any
     obligations payable by the Borrower under this Agreement and the other
     Credit Documents, (c) reduce any amount payable by the Borrower
     hereunder or under any of the other Credit Documents, (d) change the
     amount of any Lender's Commitment or Commitment Percentage, (e) amend,
     modify or waive any provision of this Subsection, (f) reduce the
     percentage specified in the definition of Required Lenders,
     (g) consent to the assignment or transfer by the Borrower of any of
     its rights or obligations under this Agreement or any of the other
     Credit Documents, (h) extend the expiry date of any Letter of Credit
     to a date which is later than the last Business Day prior to the
     Termination Date, (i) release any Collateral having an aggregate value
     exceeding Five Hundred Thousand Dollars ($500,000.00), or (j) amend or
     modify the definitions contained in this Agreement of "Aggregate
     Borrowing Base," "Accounts Credit Percentage" or "L/C Maximum
     Exposure," in each case without the written consent of all the Lenders
     and, in the case of any amendment, modification, extension, renewal,
     supplement, replacement or waiver affecting the provisions of
     Section 3 or any L/C Agreements, without the written consent of the
     then Issuing Bank and, in the case of any amendment, modification,
     extension, renewal, supplement, replacement or waiver affecting the
     provisions of Section 9, without the written consent of the then
     Agent.  Any such waiver and any such amendment, modification,
     extension, renewal, supplement or replacement shall apply equally to
     each of the Lenders and shall be binding upon the Borrower, the
     Lenders, the Agent and all future holders of the Notes.  In the case
     of any waiver, the Borrower, the Lenders and the Agent shall be
     restored to their former position and rights hereunder and under the
     outstanding Notes, and any Default or Event of Default waived shall be
     deemed to be cured; but no such waiver shall extend to any subsequent
     or other Default or Event of Default, or impair any right consequent
     thereupon.  With the consent of the Required Lenders, the Agent may,
     or upon the request of the Required Lenders, the Agent shall, enter
     into any amendments of the Intercreditor Agreement or issue or grant
     consents or waivers relating thereto.

               10.2 More Restrictive Provisions.  In the event that, after
                    ---------------------------
     the date of this Agreement, the Borrower enters into or becomes bound
     by any credit agreement or other loan agreement, document or
     instrument, or any amendment, modification, supplement or restatement
     thereof, which requires the Borrower to comply with any financial
     covenants




















     
<PAGE>

<PAGE>
     

     which are in addition to or more restrictive (the "Additional/More
     Restrictive Provisions") than the covenants contained in
     Subsection 7.1 of this Agreement, this Agreement shall be and shall be
     deemed to be automatically and immediately amended to include such
     Additional/More Restrictive Provisions.  In the event that such credit
     agreement or other loan agreement or document which contains the
     Additional/More Restrictive Provisions, or the Additional/More
     Restrictive Provisions, are terminated and of no further force or
     effect, then any amendment of this Agreement effected as a result of
     the provisions of this Subsection shall be of no further force or
     effect and this Agreement shall be and shall be deemed to be
     automatically and immediately amended to conform to the terms of this
     Agreement prior to such amendment of this Agreement effected pursuant
     to this Subsection as a result of such Additional/More Restrictive
     Provisions.  In the event that, after an amendment of this Agreement
     effected pursuant to this Subsection as a result of Additional/More
     Restrictive Provisions, such Additional/More Restrictive Provisions
     shall be amended or modified and the result of such amendment or
     modification is to cause some or all of such Additional/More
     Restrictive Provisions to be more restrictive or less restrictive, but
     in any event more restrictive than the financial covenants contained
     in Subsection 7.1 of this Agreement prior to such amendment of this
     Agreement, then this Agreement shall be and shall be deemed to be
     automatically and immediately amended to conform to such
     Additional/More Restrictive Provisions, as so amended or modified. 
     Upon request of the Required Lenders at any time or from time to time,
     the Borrower shall execute and deliver to the Agent, with sufficient
     copies for each of the Lenders and the Issuing Bank, such amendments
     of this Agreement, and such other agreements, instruments and
     documents, as may be requested by the Required Lenders to further
     memorialize amendments of this Agreement pursuant to this Subsection.

               10.3 Notices.  All notices, requests and demands to or upon
                    -------
     the respective parties hereto to be effective shall be in writing
     (including by telecopy transmission), and, unless otherwise expressly
     provided herein, shall be deemed to have been duly given or made when
     delivered by hand, or, if earlier, three (3) days after being
     deposited in the mail, postage prepaid, or, in the case of notice by
     telecopy transmission, when transmitted, addressed as follows in the
     case of the Borrower and the Agent, and as set forth in Schedule II in
     the case of the other parties hereto, or to such other address as may
     be hereafter notified by the respective parties hereto and any future
     holders of the Notes:

               The Borrower:      York Road and Industry Lane
                                  Hunt Valley, Maryland 21030
                                  Telecopy:  410/683-6488


























     
<PAGE>

<PAGE>
     

               The Agent:         First Fidelity Bank, National Association
                                  123 South Broad Street
                                  Philadelphia, Pennsylvania 19109
                                  Attention:  Michael W. Coiley
                                  Telecopy:  215/985-6079

               The Issuing Bank:  First Fidelity Bank, National Association
                                  123 South Broad Street
                                  Philadelphia, Pennsylvania 19109
                                  Attention:  Michael W. Coiley
                                  Telecopy:  215/985-6079

     provided that any notice, request or demand to or upon the Agent or
     --------
     the Lenders pursuant to Subsections 2.3, 2.5, 2.7 and 2.9, or to or
     upon the Issuing Bank pursuant to Subsections 3.2 and 3.8, shall not
     be effective until received.

               10.4 No Waiver; Cumulative Remedies.  No failure to exercise
                    ------------------------------
     and no delay in exercising, on the part of the Agent, the Issuing Bank
     or any Lender, any right, remedy, power or privilege hereunder or
     under the Credit Documents, shall operate as a waiver thereof; nor
     shall any single or partial exercise of any right, remedy, power or
     privilege hereunder or thereunder preclude any other or further
     exercise thereof or the exercise of any other right, remedy, power or
     privilege.  The rights, remedies, powers and privileges herein
     provided or provided in the other Credit Documents are cumulative and
     not exclusive of any rights, remedies, powers and privileges provided
     by law.

               10.5 Survival of Representations and Warranties.  All
                    ------------------------------------------
      representations and warranties made hereunder, in the other Credit
     Documents and in any document, certificate or statement delivered
     pursuant hereto or in connection herewith shall survive the execution
     and delivery of this Agreement, the Letters of Credit and the Notes.

               10.6 Payment of Expenses and Taxes.  The Borrower agrees
                    -----------------------------
     (a) to pay or reimburse the Agent for all its out-of-pocket costs and
     expenses incurred in connection with the development, preparation and
     execution of', and any amendment, modification, extension, renewal,
     supplement or replacement of, this Agreement, the other Credit
     Documents, the Intercreditor Agreement and any other documents
     prepared in connection herewith or therewith, and the preservation of
     any rights or interests thereunder, and the consummation of the
     transactions contemplated hereby and thereby, including, without
     limitation, the reasonable fees and disbursements of counsel to the
     Agent, (b) to pay or reimburse each Lender, the Issuing Bank and the
     Agent for all their costs and expenses























     
<PAGE>

<PAGE>
     

     incurred in connection with the enforcement of any rights under this
     Agreement, the other Credit Documents, the Intercreditor Agreement and
     any such other documents, including, without limitation, reasonable
     fees and disbursements of counsel to the Agent, the Lenders and the
     Issuing Bank, (c) to pay, indemnify, and hold each Lender, the Issuing
     Bank and the Agent harmless from, any and all recording and filing
     fees and any and all liabilities with respect to, or resulting from
     any delay in paying, stamp, excise and other taxes, if any, which may
     be payable or determined to be payable in connection with the
     execution and delivery of, or consummation of any of the transactions
     contemplated by, or any amendment, modification, extension, renewal,
     supplement or replacement of, or any waiver or consent under or in
     respect of, this Agreement, the other Credit Documents and any such
     other documents, and (d) to pay, indemnify, and hold each Lender, the
     Agent and the Issuing Bank harmless from and against any and all other
     liabilities, obligations, losses, damages, penalties, actions,
     judgments, suits, costs, expenses or disbursements of any kind or
     nature whatsoever with respect to the execution, delivery,
     enforcement, performance and administration of this Agreement, the
     other Credit Documents and any such other documents (all the
     foregoing, collectively, the "indemnified liabilities"), provided,
                                                              --------
     that the Borrower shall have no obligation hereunder to the Agent, any
     Lender or the Issuing Bank with respect to indemnified liabilities
     arising from (i) the gross negligence or willful misconduct of the
     Agent, any such Lender or the Issuing Bank, (ii) legal proceedings
     commenced against the Agent, any such Lender or the Issuing Bank by
     any security holder or creditor thereof arising out of and based upon
     rights afforded any such security holder or creditor solely in its
     capacity as such, or (iii) legal proceedings commenced against the
     Agent, any such Lender or the Issuing Bank by any other Lender, the
     Agent, the Issuing Bank or by any Transferee (as defined in
     Subsection 10.12).  The agreements in this Subsection shall survive
     the termination of this Agreement and payment of the outstanding Notes
     for a period of two (2) years.

               10.7 Further Assurances.  The Borrower agrees promptly to
                    ------------------
     do, make, execute and deliver all such additional and further acts,
     things, deeds, assurances, instruments and documents as the Agent, the
     Issuing Bank or any Lender may reasonably request to vest in and
     assure to the Agent, the Issuing Bank or any Lender its rights under
     this Agreement or any of the other Credit Documents.

               10.8 Unenforceability.  If any term, provision or condition,
                    ----------------
     or any part thereof, of this Agreement or any of the other Credit
     Documents shall for any reason be found or held invalid or
     unenforceable by any court or Governmental Authority, such invalidity
     or unenforceability shall not affect the remainder of such term,
     provision or condition, nor any other term, provision or condition,
     and this Agreement and the other Credit Documents shall survive and be
     construed as if such invalid or unenforceable term,





















     
<PAGE>

<PAGE>
     

     provision or condition had not been contained herein or therein;
     provided, however, that if any rate of interest provided under this
     Agreement or any of the other Credit Documents does or shall exceed
     the maximum interest rate permitted by law, then such rate of interest
     shall immediately be deemed to be reduced to such maximum rate and all
     previous payments of interest in excess of the maximum rate shall be
     deemed to have been payments in reduction of principal and not of
     interest.

               10.9 Indemnification Concerning Fees.  The Borrower agrees
                    -------------------------------
     to indemnify, protect and defend the Agent, the Issuing Bank and each
     Lender, and save the Agent, the Issuing Bank and each Lender harmless,
     from and against any and all claims, demands, damages, losses,
     liabilities, obligations, penalties, litigation, defenses, judgments,
     suits, actions, proceedings, costs and expenses (including, without
     limitation, counsel fees and expenses) of any kind or nature
     whatsoever which may at any time be imposed upon, paid or incurred by
     or asserted or awarded against the Agent, the Issuing Bank or any of
     the Lenders relating to, resulting from or arising out of any broker's
     or finder's fee or commission which the Agent, the Issuing Bank or
     such Lender, as the case may be, did not directly contract or agree to
     pay.

               10.10     Waiver of Trial by Jury.  Each of the Borrower,
                         -----------------------
     the Agent, each Lender and the Issuing Bank agrees that any action,
     suit or proceeding involving any claim, counterclaim or cross-claim
     arising out of or in any way relating, directly or indirectly, to this
     Agreement or any of the other Credit Documents, or any liabilities,
     rights or interests of the Borrower, the Agent, the Issuing Bank, any
     Lender or any other Person arising out of or in any way relating,
     directly or indirectly, to any of the foregoing, shall be tried by a
     court and not by a jury.  Each of the Borrower, the Agent, the Issuing
     Bank and each Lender hereby waives any right to trial by jury in any
     such action, suit or proceeding, with the understanding and agreement
     that this waiver constitutes a waiver of trial by jury of all claims,
     counterclaims and cross-claims against all parties to such actions,
     suits or proceedings, including claims, counterclaims and cross-claims
     against parties who are not parties to this Agreement or the other
     Credit Documents.  This waiver is knowingly, willingly and voluntarily
     made by each of the parties hereto, and each of the parties hereto
     acknowledges and agrees that this waiver of trial by jury is a
     material aspect of the agreements among them and that no
     representations of fact or opinion have been made by any Person to
     induce this waiver of trial by jury or to modify, limit or nullify its
     effect.

               10.11     Additional Waivers.  The Borrower hereby waives,
                         ------------------
     to the extent the same may be waived under applicable law:  (a) notice
     of acceptance of this Agreement or any of the other Credit Documents
     by any other party hereto; (b) all claims, causes of action and rights
     of the Borrower against the Agent, the Issuing Bank or any Lender on
     account of



















     
<PAGE>

<PAGE>
     

     actions taken or not taken by any of them in the exercise of any of
     their rights or remedies under this Agreement or any of the other
     Credit Documents, or under law, provided that the same did not arise
     from their gross negligence or willful misconduct; and (c) all claims
     and causes of action of the Borrower against the Agent, the Issuing
     Bank or any Lender for punitive, exemplary, consequential, special or
     other indirect or non-compensatory damages.

               10.12     Successors and Assigns; Participations; Purchasing
                         --------------------------------------------------
     Lenders.  (a)  This Agreement shall be binding upon and inure to the
     -------
     benefit of the Borrower, the Lenders, the Agent, the Issuing Bank, all
     future holders of the Notes and their respective successors and
     assigns, except that the Borrower may not assign or transfer any of
     its rights or obligations under this Agreement without the prior
     written consent of each Lender and, in the case of any of its rights
     or obligations under L/C Agreements or otherwise relating to Letters
     of Credit, without the prior written consent of the Issuing Bank.

                    (b)  Any Lender may, in the ordinary course of its
     commercial banking business and in accordance with applicable law, at
     any time sell to one or more entities ("Participants") participating
     interests in any Revolving Credit Loans owing to such Lender, any
     Notes held by such Lender, any Commitments of such Lender or any other
     interests of such Lender hereunder.  In the event of any such sale by
     a Lender to a Participant of a participating interest in such Lender's
     obligations under this Agreement, such Lender shall remain the holder
     of any such Notes for all purposes under this Agreement and the other
     Credit Documents, and the Borrower, the Agent and the Issuing Bank
     shall continue to deal solely and directly with such Lender in
     connection with such Lender's rights and obligations under this
     Agreement and the other Credit Documents.  The Borrower agrees that if
     amounts outstanding under this Agreement or the Notes are due or
     unpaid, or shall have been declared or shall have become due and
     payable as a result of the occurrence of an Event of Default, each
     Participant shall be deemed to have the right of setoff in respect of
     its participating interest in amounts owing under this Agreement and
     any Notes to the same extent as if the amount of its participating
     interest were owing directly to it as a Lender under this Agreement or
     any Notes, provided that such right of setoff shall be subject to the
                --------
     obligation of such Participant to share with the Lenders and the
     Issuing Bank, and the Lenders  and the Issuing Bank agree to share
     with such Participant, as provided in Subsection 10.13.  The Borrower
     also agrees that each Participant shall be entitled to the benefits of
     Subsections 2.16, 2.17, and 2.18 with respect to its participation in
     the Commitments and the Eurodollar Loans outstanding from time to
     time; provided that no Participant shall be entitled to receive any
           --------
     greater amount pursuant to such Subsections than the transferor Lender
     would have been entitled to receive in respect of the amount of the
     participation transferred by such transferor Lender to such
     Participant had no such transfer occurred.




















     
<PAGE>

<PAGE>
     

                    (c)  Any Lender may, in the ordinary course of its
     commercial banking business, in accordance with applicable law, at any
     time sell to any Affiliate of such Lender or to any other Lender ,
     and, with the consent of the Borrower and the Agent (which in each
     case shall not be unreasonably withheld), to one or more additional
     financial institutions ("Purchasing Lenders") all or any part of its
     rights and obligations under this Agreement and the other Credit
     Documents pursuant to a Commitment Transfer Supplement, substantially
     in the form of Exhibit H, executed by such Purchasing Lender, such
     transferor Lender and the Agent (and, in the case of a Purchasing
     Lender that is not then a Lender or an Affiliate thereof, by the
     Borrower).  Upon (i) such execution of such Commitment Transfer
     Supplement, (ii) delivery of an executed copy thereof to the Borrower
     and (iii) payment by such Purchasing Lender, such Purchasing Lender
     shall for all purposes be a Lender party to this Agreement and shall
     have all the rights and obligations of a Lender under this Agreement,
     to the same extent as if it were an original party hereto with the
     Commitment Percentage of the Commitments set forth in such Commitment
     Transfer Supplement.  Such Commitment Transfer Supplement shall be
     deemed to amend this Agreement to the extent, and only to the extent,
     necessary to reflect the addition of such Purchasing Lender and the
     resulting adjustment of Commitment Percentages arising from the
     purchase by such Purchasing Lender of all or a portion of the rights
     and obligations of such transferor Lender under this Agreement and the
     Notes.  Upon the consummation of any transfer to a Purchasing Lender,
     pursuant to this paragraph (c), the transferor Lender, the Agent and
     the Borrower shall make appropriate arrangements so that, if required,
     replacement Notes are issued to such transferor Lender and new Notes
     or, as appropriate, replacement Notes, are issued to such Purchasing
     Lender, in each case in principal amounts reflecting their Commitment
     Percentages or, as appropriate, reflecting their outstanding Revolving
     Credit Loans as adjusted pursuant to such Commitment Transfer
     Supplement.

                    (d)  In the case of each sale by a Lender pursuant to
     Section 10.12(b) or 10.12(c), the selling Lender shall pay to the
     Agent an administration fee equal to Two Thousand Five Hundred Dollars
     ($2,500.00).

                    (e)  The Borrower authorizes the Agent and each Lender
     to disclose to any Participant or Purchasing Lender (each, a
     "Transferee") and any prospective Transferee any and all financial
     information in the Agent's or such Lender's possession concerning the
     Borrower or the Other Obligors which has been delivered to the Agent
     or such Lender pursuant to this Agreement or the other Credit
     Documents or which has been delivered to the Agent or such Lender by
     the Borrower or the Other Obligors in connection with credit
     evaluation of the Borrower prior to entering into this Agreement.


























     
<PAGE>

<PAGE>
     

                    (f)  If, pursuant to this Subsection, any interest in
     this Agreement or any Note is transferred to any Transferee which is
     organized under the laws of any jurisdiction other than the United
     States of America or any state thereof, the transferor Lender shall
     cause such Transferee, concurrently with the effectiveness of such
     transfer, (i) to represent to the transferor Lender (for the benefit
     of the transferor Lender, the Agent and the Borrower) that under
     applicable law and treaties no taxes will be required to be withheld
     by the Agent, the Borrower or the transferor Lender with respect to
     any payments to be made to such Transferee in respect of the Revolving
     Credit Loans, (ii) to furnish to the transferor Lender, the Agent and
     the Borrower either U.S. Internal Revenue Service Form 4224 or U.S.
     Internal Revenue Service Form 1001 completed in accordance with
     clauses (i) and (ii) of Subsection 2.16(b) (wherein such Transferee
     claims entitlement to complete exemption from U.S. federal withholding
     tax on all interest payments hereunder), (iii) to furnish to the
     transferor Lender, the Agent and the Borrower an Internal Revenue
     Service Form W-8 or W-9 or successor applicable form, as the case may
     be, to establish an exemption from United States backup withholding
     tax, and (iv) to agree (for the benefit of the transferor Lender, the
     Agent and the Borrower) to provide the transferor Lender, the Agent
     and the Borrower a new Form 4224 or Form 1001, or a new Form W-8 or W-
     9, upon the obsolescence of any previously delivered form, and
     comparable statements in accordance with applicable laws and
     regulations, and amendments, duly executed and completed by such
     Transferee, and to comply from time to time with all applicable laws
     and regulations with regard to such withholding tax exemption.

                    (g)  The Borrower acknowledges that First Fidelity, or
     its holding company, is acquiring The Bank of Baltimore and that, upon
     any merger of First Fidelity and The Bank of Baltimore, one hundred
     percent (100%) of the Commitments held by First Fidelity and The Bank
     of Baltimore, as Lenders hereunder, as of the date of this Agreement
     will, together with all rights and interests relating thereto,
     thereafter be held by the survivor of such merger.

               10.13     Adjustments; Periodic Charging of Accounts;
                         -------------------------------------------
     Setoff.  (a)  If any Lender (a "benefitted Lender") shall at any time
     ------
     receive any payment of all or part of the obligations owing to it
     under this Agreement or any of the other Credit Documents, or interest
     thereon, or receive any collateral in respect thereof (whether
     voluntarily or involuntarily, by setoff, pursuant to events or
     proceedings of the nature referred to in clause (h) of Section 8, or
     otherwise) in a greater proportion than any such payment to and
     collateral received by any other Lender with respect to corresponding
     obligations owing to such other Lender under this Agreement or any of
     the other Credit Documents, or interest thereon, such benefitted
     Lender shall purchase for cash from the other Lender such portion of
     the obligations owing to such other Lender under this Agreement or the
     other Credit






















     
<PAGE>

<PAGE>
     

     Documents, or shall provide such other Lender with the benefits of any
     such collateral, or the proceeds thereof, as shall be necessary to
     cause such benefitted Lender to share the excess payment or benefits
     of such collateral or proceeds ratably with such other Lender;
     provided that if all or any portion of such excess payment or benefits
     --------
     is thereafter recovered from such benefitted Lender, such purchase
     shall be rescinded, and the purchase price and benefits returned, to
     the extent of such recovery, with interest on the same ratable basis
     if the benefitted Lender is required to pay interest on the amount
     recovered from the benefitted Lender.  The Borrower agrees that each
     Lender so purchasing a portion of such obligations owing to another
     Lender may exercise all rights of payment (including, without
     limitation, rights of setoff) with respect to such portion as fully as
     if such Lender were the direct holder of such portion.

                    (b)  The Borrower specifically authorizes the Agent to,
     but the Agent shall not be required to, charge and deduct from any
     Cash Collateral Account or from any checking account, collection
     account, disbursement account, concentration account or any other
     deposit account of the Borrower at First Fidelity, when and as the
     same become due, any payments on account of Revolving Credit Loans or
     L/C Reimbursement Obligations, including principal and interest, or on
     account of indemnification liabilities, fees, commissions, costs or
     expenses.  In addition, the Agent, each Lender and the Issuing Bank
     shall have the right, without prior notice to the Borrower, any such
     notice being expressly waived by the Borrower to the extent permitted
     by applicable law, upon any amount becoming due and payable by the
     Borrower hereunder or under the other Credit Documents (whether by
     demand, stated maturity, acceleration or otherwise) to setoff and
     appropriate and apply against any and all deposits (general or
     special, time or demand, provisional or final), in any currency, and
     any other credits, Indebtedness or claims, in any currency, in each
     case whether direct or indirect, absolute or contingent, matured or
     unmatured, at any time held or owing by the Agent, such Lender or the
     Issuing Bank to or for the credit or the account of the Borrower. 
     Each of the Agent, each Lender and the Issuing Bank agrees promptly to
     notify each other party to this Agreement after any such setoff and
     application made by it, provided that the failure to give such notice
                             --------
     shall not affect the validity of such setoff and application.

               10.14     Additional Lenders and Additional Credit.  The
                         ----------------------------------------
     Agent agrees to use reasonable efforts to identify an additional
     financial institution or financial institutions which will, pursuant
     to such amendments of this Agreement and other Credit Documents as are
     satisfactory to the Agent and the Required Lenders, become a Lender or
     Lenders under this Agreement and issue, upon the terms and conditions
     hereof, additional Revolving Credit Commitments aggregating Ten
     Million Dollars ($10,000,000.00) so that the aggregate Revolving
     Credit Commitments will then be Thirty Million Dollars
     ($30,000,000.00).  In





















     
<PAGE>

<PAGE>
     

     such event (a) it is contemplated by the parties hereto that the L/C
     Maximum Exposure, the Commercial L/C Maximum Exposure and the Standby
     L/C Maximum Exposure will each be increased to Fifteen Million Dollars
     ($15,000,000.00), and (b) the Borrower shall pay to the Agent a
     facility fee equal to three-quarters of one percent (.75%) of the
     aggregate amount of such additional Revolving Credit Commitments.  In
     no event shall the Agent have any liability to any Person, and in no
     event shall any obligations of any Person be diminished or reduced, on
     account of any failure of the Agent to so identify any such financial
     institution or financial institutions.

               10.15     Counterparts.  This Agreement may be executed by
                         ------------
     one or more of the parties to this Agreement on any number of separate
     counterparts and all of said counterparts taken together shall be
     deemed to constitute one and the same instrument.  

               10.16     GOVERNING LAW.  THIS AGREEMENT, THE NOTES AND THE
                         -------------
     OTHER CREDIT DOCUMENTS, AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES
     HEREUNDER AND THEREUNDER, SHALL BE GOVERNED BY, AND CONSTRUED AND
     INTERPRETED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF
     MARYLAND, EXCLUSIVE OF PRINCIPLES OF CONFLICTS OF LAWS.  IN ADDITION,
     SECTION 3 OF THIS AGREEMENT, L/C AGREEMENTS AND LETTERS OF CREDIT, AND
     ALL TRANSACTIONS THEREUNDER, SHALL BE GOVERNED BY, AND CONSTRUED AND
     INTERPRETED IN ACCORDANCE WITH, THE UNIFORM CUSTOMS AND PRACTICE FOR
     DOCUMENTARY CREDITS OF THE INTERNATIONAL CHAMBER OF COMMERCE IN EFFECT
     FROM TIME TO TIME, TO THE EXTENT NOT INCONSISTENT WITH SUCH INTERNAL
     LAWS OF THE STATE OF MARYLAND.

               10.17     Submission To Jurisdiction.  The Borrower hereby
                         --------------------------
     irrevocably and unconditionally:

                    (a)  submits for itself and its property in any legal
     action or proceeding relating to this Agreement or any of the other
     Credit Documents, or for recognition and enforcement of any judgment
     in respect thereof, to the non-exclusive general jurisdiction of any
     state or federal court in the State of Maryland and appellate courts
     from any thereof, and, in the case of any legal action or proceeding
     relating to any Letter of Credit or any L/C Agreement, or for
     recognition and enforcement of any judgment in respect thereof, to the
     non-exclusive general jurisdiction of any state or federal court in
     the Commonwealth of Pennsylvania, and appellate courts from any
     thereof, in addition to such other courts in which jurisdiction may be
     appropriate;




























     
<PAGE>

<PAGE>
     

                    (b)  consents that any such action or proceeding may be
     brought in such courts, and waives any objection that it may now or
     hereafter have to the venue of any such action or proceeding in any
     such court or that such action or proceeding was brought in an
     inconvenient court and agrees not to plead or claim the same;

                    (c)  agrees that service of process in any such action
     or proceeding may be effected by mailing a copy thereof by registered
     or certified mail (or any substantially similar form of mail), postage
     prepaid, to the Borrower at its address set forth in Subsection 10.3
     or at such other address of which the Agent shall have been notified
     pursuant thereto; and

                    (d)  agrees that nothing herein shall affect the right
     to effect service of process in any other manner permitted by law or
     shall limit the right to sue in any other jurisdiction.

               10.18     Payments in Foreign Currency.  Subject to the
                         ----------------------------
     applicable provisions of Subsection 3.8, if any payment on account of
     any Indebtedness or any other obligation or liability of the Borrower
     under this Agreement or any of the other Credit Documents shall be
     made to or for the account of the Agent, the Issuing Bank or any
     Lender, or received by or for the account of the Agent, the Issuing
     Bank or any Lender, in a currency other than Dollars, whether pursuant
     to a judgment or order of any Governmental Authority or otherwise,
     such payment shall constitute a discharge of such Indebtedness or such
     other obligation or liability of the Borrower only to the extent of
     the amount of Dollars which the Agent, the Issuing Bank or such
     Lender, as the case may be, is able to purchase on the spot market,
     through the office of the Agent indicated in Subsection 10.3, the
     office of the Issuing Bank indicated in Subsection 10.3 or the
     Domestic Lending Office of such Lender, as the case may be, at the
     opening of business on the date of receipt of such payment, in
     accordance with the usual foreign exchange practices of the Agent, the
     Issuing Bank or such Lender, as the case may be, with the amount of
     such currency so received.  If the amount of Dollars which the Agent,
     the Issuing Bank or such Lender is so able to purchase is less than
     the amount of Dollars originally payable to the Agent, the Issuing
     Bank or such Lender, the Borrower shall indemnify and save harmless
     the Agent, the Issuing Bank or such Lender, as the case may be, from
     and against any loss or damage arising as a result of such deficiency. 
     This indemnity shall constitute an obligation of the Borrower but
     separate and independent from the other obligations of the Borrower
     under this Agreement and the other Credit Documents, shall give rise
     to a separate and independent cause of action, shall apply
     irrespective of any indulgence granted to the Borrower by the Agent,
     the Issuing Bank or any Lender from time to time and shall continue in
     full force and effect notwithstanding any judgment or order for a
     liquidated sum in respect of such Indebtedness or any such other
























     
<PAGE>

<PAGE>
     

     obligation or liability of the Borrower so paid in a currency other
     than Dollars.  The agreements in this Subsection shall survive the
     termination of this Agreement and payment of the outstanding Notes for
     a period of two (2) years.

               10.19     Acknowledgment Concerning Intercreditor Agreement.
                         -------------------------------------------------
     The Borrower hereby acknowledges and consents to all of the provisions
     of the Intercreditor Agreement, including the provisions relating to
     the amendment, modification or waiver thereof.  The Borrower
     specifically acknowledges and assumes all of the risks that, as a
     result of provisions of the Intercreditor Agreement, decisions may be
     made by the Lenders or the Issuing Bank to cease extending credit to
     the Borrower or to take or omit to take other actions which, but for
     the existence of the Intercreditor Agreement, the Lenders or the
     Issuing Bank might not decide to take or omit to take.


























































     
<PAGE>

<PAGE>
     

               IN WITNESS WHEREOF, the parties hereto have caused this
     Agreement to be duly executed under seal and delivered by their proper
     and duly authorized officers as of the day and year first above
     written.

     ATTEST/WITNESS:                    AAI CORPORATION



                                        By:         (SEAL)                 
                                           --------------------------------
                                           Paul J. Michaud
                                           Vice President



   
                                        FIRST FIDELITY BANK, NATIONAL
                                           ASSOCIATION, as Agent, as a
                                           Lender and as Issuing Bank




                                        By:         (SEAL)                 
                                           --------------------------------
                                           Michael W. Coiley
                                           Vice President


                                        THE BANK OF BALTIMORE



                                        By:         (SEAL)                 
                                           --------------------------------
                                           Robert C. Brennan
                                           Senior Vice President
































     
<PAGE>

<PAGE>
     

                                                                 Schedule I
                                                        to Credit Agreement
                                                        -------------------

                           BORROWER BUSINESS PREMISES
                           --------------------------

     York Road and Industry Lane
     Hunt Valley, Maryland  21030-0126

     10139 York Road
     Cockeysville, Maryland  21030

     Building 200
     11101 Gilroy Road
     Hunt Valley, Maryland  21031

     2801 Professional Parkway
     Ocoee, Florida  32801

     One Crystal Park
     2011 Crystal Drive, Suite 107
     Arlington, Virginia  22202

     1235 Jefferson Davis Highway
     Suite 1, Crystal Gateway 1
     Arlington, Virginia  22201

     Stoneridge Atrium, Suite 270
     5776 Stoneridge Mall Road
     Pleasanton, California  94588

     4027 Colonel Glenn Highway
     Office No. 407
     Beavercreek, Ohio  45431-1672

     370 South 500 East
     Suites 126 and 130
     Clearfield, Utah  84015



































     
<PAGE>

<PAGE>
     

     1300 East Grand
     Clovis, New Mexico  88101

     7323 Highway 90 West, Suite 405
     San Antonio, Texas  78227





































































     
<PAGE>

<PAGE>
     

                                                                Schedule II
                                                        to Credit Agreement
                                                        -------------------


                        LENDING OFFICES  AND COMMITMENTS
                        --------------------------------


     Lending Offices:
     ----------------
                            Domestic               Eurodollar
     Lender                 Lending Office         Lending Office
     ------                 --------------         --------------

     First Fidelity Banks   123 South Broad Street 123 South Broad Street
       National Association Philadelphia, PA 19109 Philadelphia, PA 19109


     The Bank of Baltimore  120 East Baltimore     120 East Baltimore
                            Street                 Street
                            Baltimore, MD 21202    Baltimore, MD 21202



     Revolving Credit Commitments:
     -----------------------------

                                                    Commitment
     Lender                       Amount            Percentage
     ------                       ------            ----------

     First Fidelity Bank,    $12,500,000.00           62.5%
       National Association

     The Bank of Baltimore   $ 7,500,000.00           37.5%




                                   (continued)

































     
<PAGE>

<PAGE>
     

                        LENDING OFFICES  AND COMMITMENTS
                        --------------------------------
                                   (continued)


     Notice Addresses:
     ----------------

     Lender                              Notice Address
     ------                              --------------
     First Fidelity Bank, National       123 South Broad Street
        Association                      Philadelphia, PA 19109
                                         Attention:  Michael Coiley
                                         Telecopy:  215/985-6079


     The Bank of Baltimore               120 East Baltimore Street
                                         Baltimore, MD  21202
                                         Attention:  James T. Pierce
                                         Telecopy:  410/539-0136






















































     
<PAGE>

<PAGE>
     

                                                               Schedule III
                                                        to Credit Agreement
                                                        -------------------

                 INDUSTRY LANE REAL PROPERTY PROPOSED TO BE SOLD
                 -----------------------------------------------

     Buildings known as Buildings 115, 116, 117, 118, 119, 120 and 121 and
     the land described in the Industry Lane Real Property Exhibit attached
     to this Schedule located at:

                    York Road and Industry Lane
                    South side Industry Lane
                    Hunt Valley, Maryland  21030




























































     
<PAGE>

<PAGE>
     

                                                                Schedule IV
                                                        to Credit Agreement
                                                        -------------------


                            REAL PROPERTY COLLATERAL
                            ------------------------



































































     
<PAGE>

<PAGE>
     

                                                                 Schedule V
                                                        to Credit Agreement
                                                        -------------------

                   YORK ROAD REAL PROPERTY PROPOSED TO BE SOLD
                   -------------------------------------------
     Building known as Building 130 and the land described in the York Road
     Real Property Exhibit attached to this Schedule located at:

                    10139 York Road
                    Cockeysville, Maryland  21030































































     
<PAGE>

<PAGE>
     

                                                               Schedule 4.7
                                                        to Credit Agreement
                                                        -------------------


                               LITIGATION MATTERS
                               ------------------



































































     
<PAGE>

<PAGE>
     

                                                               Schedule 4.8
                                                        to Credit Agreement
                                                        -------------------


                             CONTRACTUAL OBLIGATIONS
                             -----------------------



































































     
<PAGE>

<PAGE>
     

                                                              Schedule 4.13
                                                        to Credit Agreement
                                                        -------------------


                              ENVIRONMENTAL MATTERS
                              ---------------------



































































     
<PAGE>

<PAGE>
     

                                                              Schedule 4.14
                                                        to Credit Agreement
                                                        -------------------


                  INTELLECTUAL PROPERTY DOMESTICALLY REGISTERED
                  ---------------------------------------------



































































     
<PAGE>

<PAGE>
     

                                                              Schedule 4.19
                                                        to Credit Agreement
                                                        -------------------


                                  ERISA MATTERS
                                  -------------



































































     
<PAGE>

<PAGE>
     

                                                               Schedule 7.3
                                                        to Credit Agreement
                                                        -------------------


                                 PERMITTED LIENS
                                 ---------------



































































     
<PAGE>

<PAGE>
     

     STATE OF MARYLAND, CITY OF BALTIMORE, SS:

               I HEREBY CERTIFY that on this 13th day of October, 1994,
     before me, the undersigned, a Notary Public of said State, personally
     appeared Paul J. Michaud, who acknowledged himself to be the Vice
     President of AAI Corporation, and that he, as such, being authorized
     so to do, executed the foregoing instrument for the purposes therein
     contained.

               WITNESS my hand and Notarial Seal.



                                                                           
                                        -----------------------------------
                                                  Notary Public

     My Commission expires:

          10/1/97
          -------

     STATE OF MARYLAND, CITY OF BALTIMORE, SS:

               I HEREBY CERTIFY that on this 13th day of October, 1994,
     before me, the undersigned, a Notary Public of said State, personally
     appeared Michael W. Coiley, who acknowledged himself to be the Vice
     President of First Fidelity Bank, National Association, as Agent,
     Lender and Issuing Bank, and that he, as such, being authorized so to
     do, executed the foregoing instrument for the purposes therein
     contained.

               WITNESS my hand and Notarial Seal.



                                                                           
                                        -----------------------------------
                                                  Notary Public

     My Commission expires:

          10/1/97
          -------






























     
<PAGE>

<PAGE>
     


     STATE OF MARYLAND, CITY OF BALTIMORE, SS:

               I HEREBY CERTIFY that on this 13th day of October, 1994,
     before me, the undersigned, a Notary Public of said State, personally
     appeared Robert C. Brennan, who acknowledged himself to be the Senior
     Vice President of The Bank of Baltimore, and that he, as such, being
     authorized so to do, executed the foregoing instrument for the
     purposes therein contained.

               WITNESS my hand and Notarial Seal.



                                                                           
                                        -----------------------------------
                                                  Notary Public

     My Commission expires:

          10/1/97
          -------




















































     
<PAGE>

<PAGE>
     

                                                                  EXHIBIT A
                                                        to Credit Agreement
							-------------------

                   APPLICATION FOR COMMERCIAL LETTER OF CREDIT


     ADVISING BANK (if applicable):

     APPLICANT (Hereinafter collectively/singularly "We", "Us", or "Our"):

     BENEFICIARY (Herein after called "Beneficiary"):

     AMOUNT:

     EXPIRATION DATE:

     Please issue and transmit by the method indicated below your
     Irrevocable Letter of Credit (hereinafter called "Credit") to be
     available to the Beneficiary by sight payment at your counters (unless
     otherwise required in Special Conditions below) against presentation
     of the following documents on or before the Expiration Date;


     Transmit this Credit via
     [_] mail/airmail
     [_] tele-transmission (telex, cable, or Swift at your option)
     [_] courier     [_] Other ____________________

     Available by draft/s at sight drawn on you, your affiliate, or
     correspondent at your option, or you may waive draft accompanied by 
     [_]             Beneficiary's signed and dated statement(s) that
                     ___________

     [_]             Other documents as indicated on the reverse hereof
                     Note:  Documents that do not specify issuer, wording,
                     or data content will be accepted as tendered
     [_]             Please issue your letter of credit in accordance with
                     the attached specimen or attached sheet which is an
                     integral part of this application and which has been
                     signed or countersigned and dated by us
     [_]             Special
                     Conditions:_________________________________________






























     
<PAGE>

<PAGE>
     

     [_]             Only one drawing up to amount of credit permitted
     [_]             Only one drawing for the amount of credit permitted
     Partial drawings will be allowed if one of these blocks is not checked


     Jointly and severally with intent to be legally bound hereby and to
     induce you or at your request any of your correspondents or affiliates
     to establish the Credit, we agree that this application is to be
     issued pursuant to applicant's most recently delivered to you Standby
     Letter of Credit Agreement, including WAIVER OF JURY TRIAL THEREIN,
     all of which are incorporated herein by reference and made a part
     hereof.  We agree that any of us may agree to increase, extension of
     maturity, or time for negotiation, or any other modification of the
     terms of the Credit, with or without notice to the others, by any
     actions you take in accordance with such increase, extension, or
     modification.

     Date: ________________ ___, 19__

     Applicant's Name__________________________________


     Authorized Signature of Applicant_______________________________

     Name/Title:     __________________________________

     Name/Title:     __________________________________

     Telephone# (_____) _________________


     If signed by a Financial Institution as Applicant, countersignature of
     Financial Institution's Customer requesting issuance of Letter of
     Credit

     Financial Institution's Customer Name________________________


     Signature       __________________________________

     Date: ______________ ___, 19___

































     
<PAGE>

<PAGE>
     

                                                                  EXHIBIT B
                                                        to Credit Agreement
                                                        -------------------

                    APPLICATION FOR STANDBY LETTER OF CREDIT


     PLEASE ISSUE AN IRREVOCABLE LETTER OF CREDIT (TOGETHER WITH ANY
     AMENDMENTS THERETO, THE "CREDIT") SUBSTANTIALLY AS SET FORTH BELOW,
     AND FORWARD VIA
     [_]  Mail/Airmail   [_]  Airmail With Preliminary Advice By
                              Teletransmission
     [_]  Full Details By Teletransmission   [_]  Courier


     ADVISING BANK (If left blank and if applicable, we will select one of
     our correspondents):


     APPLICANT:  __________________________________


     BENEFICIARY:  ________________________________


     AMOUNT:  ____________________________


     EXPIRATION DATE ___________/______/_______
                         Month     Day  Year
     AT THE COUNTERS OF THE PAYING, ACCEPTING, OR NEGOTIATING BANK AS THE
     CASE MAY BE


     CREDIT IS TO BE AVAILABLE WITH:

     ANY NEGOTIATING BANK (FREELY NEGOTIABLE) OR AS CHECKED BELOW

     [_]  YOURSELVES (RESTRICTED TO YOUR COUNTERS)

     [_]  ________________________________________

































     
<PAGE>

<PAGE>
     

     DRAFTS MAY BE DRAWN ON YOU, YOUR CORRESPONDENT, OR AFFILIATE AT YOUR
     OPTION OR YOU MAY WAIVE DRAFTS.

     [_]  INSURANCE WILL BE COVERED BY US.  WE AGREE TO KEEP INSURANCE
          COVERAGE IN FORCE UNTIL WE REIMBURSE YOU FOR ALL OBLIGATIONS
          UNDERTAKEN BY YOU HEREUNDER.


     CREDIT IS TO BE AVAILABLE BY:

     [_] SIGHT PAYMENT

     [_] ACCEPTANCE

         ___  DAYS SIGHT
         ___  DAYS DATE

          [_] FROM TRANSPORT DOCUMENT DATE

          [_] FROM INVOICE DATE

          [_] ____________________________

     [_] DEFERRED PAYMENT ____________________________


                               DOCUMENTS REQUIRED

     [_]  SIGNED COMMERCIAL INVOICE     [_]  PACKING LIST
     [_]  CERTIFICATE OF ORIGIN
     [_]  SPECIAL CUSTOMS INVOICE FORM # ___________________________
     [_]  NEGOTIABLE INSURANCE POLICY
          OR CERTIFICATE COVERING  [_] MARINE [_] AIR [_] WAR 
                                   [_] ALL RISKS [_] OTHER RISKS _____
          _______________ for _______________% of the Trade Term Value if
          and as indicated below
     [_]  FULL SET OF CLEAN ON BOARD OCEAN BILLS OF LADING ISSUED TO ORDER
          OF FIRST FIDELITY BANK, NATIONAL ASSOCIATION




































     
<PAGE>

<PAGE>
     

     [_]  FULL SET OF CLEAN ON BOARD OCEAN BILLS OF LADING ISSUED TO ORDER
          OF SHIPPER AND ENDORSED IN BLANK
     [_]  MULTIMODAL TRANSPORT DOCUMENT ISSUED TO THE ORDER OF FIRST
          FIDELITY BANK, NATIONAL ASSOCIATION
     [_]  AIR WAYBILL CONSIGNED TO ___________________________________
     [_]  TRUCK OR FAIL BILL OF LADING CONSIGNED TO __________________
     [_]  OTHER TRANSPORT DOCUMENT (please specify) __________________
     TRANSPORT DOCUMENT MUST BE MARKED   
          [_] FREIGHT PREPAID [_] FREIGHT COLLECT
     AND MUST BE MARKED NOTIFY _______________________________________
     [_]  OTHER DOCUMENTS AND SPECIAL INSTRUCTIONS ___________________


                             MERCHANDISE DESCRIPTION

     COVERING MERCHANDISE TO BE DESCRIBED IN THE INVOICE AS FOLLOWS AND
     INDICATING A TRADE TERM IF AND AS INDICATED BELOW:
     (Note:  please avoid using excessive merchandise description)


     SHIPMENT FROM: _________________________
     SHIPMENT TO:  __________________________


                                   TRADE TERMS
               DEPARTURE                          MAIN CARRIAGE
               [_] EXW                                 UNPAID
                                                  [_] FCA  [_] FAS  [_] FOB
               MAIN CARRIAGE
                    PAID                               ARRIVAL
               [_] CFR  [_] CIF              [_] DAF  [_] DES  [_] DEQ
               [_] CPT  [_] CIP                   [_] DDU  [_] DDP


     OTHER TERMS
     NAMED PLACE, PORT OF SHIPMENT, OR PORT OR PLACE OF DESTINATION        
                                                                    -------

                                 SHIPPING TERMS



































     
<PAGE>

<PAGE>
     

     Transport document to be __________/__________/__________
     dated not later than        Month      Day   Year

     [_]  PARTIAL SHIPMENT/DRAWING NOT PERMITTED
     [_]  TRANSHIPMENT NOT PERMITTED
     NOTE:     Partial shipment/drawing & transhipment is allowed unless
               otherwise indicated


                                   OTHER TERMS
     DOCUMENTS MUST BE PRESENTED TO THE NEGOTIATING/PAYING/ACCEPTING BANK
     WITHIN ____ DAYS AFTER DATE OF ISSUANCE OF TRANSPORT DOCUMENTS BUT
     WITHIN VALIDITY OF CREDIT (IF LEFT BLANK, IT WILL BE UNDERSTOOD TO BE
     21 DAYS)

     [_]  ALL BANKING CHARGES OTHER THAN ISSUING BANK CHARGES ARE FOR THE
          ACCOUNT OF THE BENEFICIARY
     [_]  DISCOUNT CHARGES (IF ANY) ARE FOR THE ACCOUNT OF THE APPLICANT
     [_]  PLEASE REFER TO THE REVERSE HEREOF OR TO THE ATTACHED SIGNED AND
          DATED SHEET WHICH FORMS AN INTEGRAL PART HEREOF


                              MAILING INSTRUCTIONS

     YOU ARE AUTHORIZED TO INSTRUCT YOUR CORRESPONDENT TO FORWARD ALL
     DOCUMENTS TO YOU IN ONE REGISTERED MAIL/AIRMAIL ENVELOPE

     FORWARD DOCUMENTS TO


     IN CASE OF NEED CONTACT WHO IS AUTHORIZED TO GIVE INSTRUCTIONS

     Contact Name ________________________

     Telephone #  __________________ FAX # ______________________







































     
<PAGE>

<PAGE>
     

     JOINTLY AND SEVERALLY WITH INTENT TO BE LEGALLY BOUND HEREBY AND TO
     INDUCE YOU, OR AT YOUR REQUEST ANY OF YOUR CORRESPONDENTS OR
     AFFILIATES, TO ESTABLISH THE CREDIT, WE AGREE THAT THIS APPLICATION IS
     TO BE ISSUED PURSUANT TO APPLICANT'S MOST RECENTLY DELIVERED TO YOU
     CONTINUING AGREEMENT FOR COMMERCIAL LETTERS OF CREDIT, INCLUDING
     WAIVER OF JURY TRIAL THEREIN, ALL OF WHICH IS INCORPORATED HEREIN BY
     REFERENCE AND MADE A PART HEREOF, WE AGREE THAT ANY OF US MAY AGREE TO
     INCREASE, EXTENSION OF MATURITY OR TIME FOR NEGOTIATION, OR ANY OTHER
     MODIFICATION OF THE TERMS OF THE CREDIT, WITH OR WITHOUT NOTICE TO THE
     OTHERS, BY ANY ACTIONS YOU TAKE IN ACCORDANCE WITH SUCH INCREASE,
     EXTENSION, OR MODIFICATION.


     Date: ___________________, 19__

     APPLICANT'S NAME                   __________________________


     AUTHORIZED SIGNATURE OF APPLICANT  __________________________

     _____signed by a Financial Institution as Applicant, countersignature
     of Financial Institution's Customer requesting issuance of Letter of
     Credit.


     Date: ___________________, 19__

     Financial Institution's Customer Name   __________________________


     Signature(s)                            __________________________











































     
<PAGE>

<PAGE>
     

                                                                  EXHIBIT C
                                                        to Credit Agreement
                                                        -------------------

                           OFFICER DEFAULT CERTIFICATE


               I, _______________________, pursuant to the Credit Agreement
     (the "Credit Agreement") dated October 13, 1994, among AAI
     CORPORATION, a Maryland corporation ("Borrower"), the person party
     thereto as Agent ("Agent"), the persons parties thereto as Lenders
     ("Lenders"), and the person party thereto as Issuing Bank ("Issuing
     Bank"), hereby certify to Agent, each Lender and Issuing Bank, that:

          1.   I am the chief financial officer of Borrower.

          2.   I have conducted a diligent inquiry concerning whether, as
     at ___________________, 19__, there existed any Default (as defined in
     the Credit Agreement) or any Event of Default (as defined in the
     Credit Agreement).

          3.   Based upon such inquiry, to my knowledge and belief, as at
     such date, [there existed no Default (as defined in the Credit
                 --------------------------------------------------
     Agreement) or Event of Default (as defined in the Credit Agreement).]
     -------------------------------------------------------------------
     [the following Default[s] (as defined in the Credit Agreement) and
      -----------------------------------------------------------------
     Event[s] of Default (as defined in the Credit Agreement)] existed and
     ---------------------------------------------------------------------
     the relevant facts with respect thereto are as follows:]
     -------------------------------------------------------
               WITNESS my signature of this _______ day of _____________,
     19_____.



                                                                           
                                        -----------------------------------
                                        Name:
                                        Title:

































     
<PAGE>

<PAGE>
     

                                                                  EXHIBIT D
                                                        to Credit Agreement
                                                        -------------------

                     OFFICER FINANCIAL COVENANT CERTIFICATE


               I, _______________________, pursuant to the Credit Agreement
     (the "Credit Agreement") dated _________________, 1994, among AAI
     CORPORATION, a Maryland corporation ("Borrower"), the person party
     thereto as Agent ("Agent"), the persons parties thereto as Lenders
     ("Lenders"), and the person party thereto as Issuing Bank ("Issuing
     Bank"), hereby certify to Agent, each Lender and Issuing Bank, that:

          1.   I am the chief financial officer of Borrower.

          2.   As at ______________, 19__ (all capitalized terms used
     hereinafter without definition having the meanings assigned to such
     terms in the Credit Agreement):

          (a)  Tangible Net Worth equalled         $___________

               (i)  Total Assets equalled  . . . . $___________
              (ii)  Intangible Assets equalled . . $___________

             (iii)  Total Liabilities equalled . . $___________

          (b)  Leverage Ratio equalled . . . . . . ___________ to
                                                   1.00

               (i)  UIC-DEL. Standby Subordinated
                    Debt Balance equalled  . . . . $___________

          (c)  Cash Flow Coverage Ratio equalled . ___________ to
                                                   1.00

               (i)  EBIT for the four quarters
                    then                           
                         ended equalled  . . . . . $___________

              (ii)  Depreciation, amortization and
                    non-cash charges deducted in
                    determining such EBIT equalled $___________

             (iii)  Current portion of Long-Term
                    Debt equalled  . . . . . . . . $___________




























     
<PAGE>

<PAGE>
     


              (iv)  Interest Expense for the four
                    quarters then ended equalled . $___________

               (v)  Operating lease payments due
                    within 12 months equalled  . . $___________

               WITNESS my signature of this _______ day of _____________,
     199_.




                                                                           
                                        -----------------------------------
     -
                                        Name:  Paul J. Michaud
                                        Title: Vice President & CFO
























































     
<PAGE>

<PAGE>
     

                                                                  EXHIBIT E
                                                        to Credit Agreement
                                                        -------------------

                          OFFICER RELIANCE CERTIFICATE


               I, _______________________, pursuant to the Credit Agreement
     (the "Credit Agreement") dated October 13, 1994, among AAI
     CORPORATION, a Maryland corporation ("Borrower"), the person party
     thereto as Agent ("Agent"), the persons parties thereto as Lenders
     ("Lenders"), and the person party thereto as Issuing Bank ("Issuing
     Bank"), hereby certify to Agent, each Lender and Issuing Bank, that:

               1.   I am the chief financial officer of Borrower.

               2.   The financial statements of Borrower and its
     Subsidiaries for the quarterly accounting period ending _____________,
     19__, which have been delivered to Agent, each Lender and Issuing
     Bank, were prepared under my supervision.

               3.   Such financial statements present fairly in all
     material respects the financial condition of Borrower and its
     Subsidiaries as at such date and the results of operations of Borrower
     and its Subsidiaries for the quarterly accounting period then ended
     and for the current fiscal year of Borrower through the end of such
     quarterly accounting period, subject to normal year-end adjustments.

               WITNESS my signature of this _______ day of _____________,
     19_____.



                                                                           
                                        -----------------------------------
     -
                                        Name:  Paul J. Michaud
                                        Title: Vice President & CFO





































     <PAGE>

<PAGE>
     

                                                                  EXHIBIT F
                                                        to Credit Agreement
                                                        -------------------

                              REVOLVING CREDIT NOTE

     [$                  ]                         [                ], 1994
      -------------------                           ----------------

               FOR VALUE RECEIVED, the undersigned, AAI CORPORATION, a
     Maryland corporation, hereby unconditionally promises to pay on the
     Termination Date, to the order of [______________________________]
     (the "Lender"), for the account of the Lender's Domestic Lending
     Office in respect of Base Rate Loans or for the account of the
     Lender's Eurodollar Lending Office in respect of Eurodollar Loans, at
     the office of First Fidelity Bank, National Association, as Agent (the
     "Agent"), 123 South Broad Street, Philadelphia, Pennsylvania 19109, in
     lawful money of the United States of America and in immediately
     available funds, the principal amount of the lesser of (a) [          
                                                                 ----------
                       ($                )], and (b) the aggregate unpaid
     -------------------------------------
     principal amount of all Revolving Credit Loans made by the Lender to
     the undersigned pursuant to the Credit Agreement dated as of
     October 13, 1994, among the undersigned, the Agent, the Lenders
     parties thereto and the Issuing Bank party thereto (as the same may be
     waived, amended, modified, extended, renewed, supplemented or replaced
     from time to time, the "Credit Agreement").  Capitalized terms
     hereinbefore or hereinafter used without definition shall have the
     meanings assigned to such terms in the Credit Agreement.

               The undersigned further agrees to pay interest in like money
     at such office on the unpaid principal amount hereof from time to time
     from the date hereof until and after such amount shall become due and
     payable (whether at stated maturity, by demand, by acceleration or
     otherwise) on the dates and at the applicable rates per annum as
     provided in Subsection 2.10 of the Credit Agreement.

               The holder of this Note is authorized to endorse the date,
     Type and amount of each Revolving Credit Loan made or converted by the
     Lender, and the date and amount of each payment or prepayment of
     principal thereof, and the unpaid principal balance thereof, on
     Schedules A and B annexed hereto and made a part hereof, or on a
     continuation thereof, which endorsement shall constitute prima facie
                                                              ----- -----
      evidence of the accuracy of the information endorsed, absent manifest
     error; provided that no failure of any holder to so endorse any such
            --------
     information shall relieve the undersigned of any of its obligations in
     respect of Revolving Credit Loans, including interest accrued thereon.
























     
<PAGE>

<PAGE>
     

               If any payment under this Note (other than payments on
     Eurodollar Loans) becomes due and payable on a day other than a
     Business Day, such payment shall be extended to the next succeeding
     Business Day, and, with respect to payments of principal, interest
     thereon shall be payable at the then applicable rate during such
     extension.  If any payment on a Eurodollar Loan becomes due and
     payable on a day other than a Working Day, the maturity thereof shall
     be extended to the next succeeding Working Day unless the result of
     such extension would be to extend such payment into another calendar
     month, in which event such payment shall be made on the immediately
     preceding Working Day.

               This Note is one of the Revolving Credit Notes referred to
     in the Credit Agreement and is entitled to the security and other
     benefits thereof and of the other Credit Documents and is subject to
     optional and mandatory prepayment in whole or in part as provided in
     the Credit Agreement.

               Upon the occurrence of any one or more Events of Default,
     all amounts then remaining unpaid on this Note shall become, or may be
     declared to be, immediately due and payable, all as provided in the
     Credit Agreement.

               Except as expressly provided herein, the undersigned hereby
     waives presentment, demand, protest, notice of protest and all other
     notices of any kind.

               The Lender, by its acceptance hereof, and the undersigned
     each agrees that any action, suit or proceeding involving any claim,
     counterclaim or cross-claim arising out of or in any way relating,
     directly or indirectly, to this Note, or any liabilities, rights or
     interests of the undersigned or the Lender arising out of or in any
     way relating, directly or indirectly, to this Note, shall be tried by
     a court and not by a jury.  The Lender, by its acceptance hereof, and
     the undersigned each hereby waives any right to trial by jury in any
     such action, suit or proceeding, with the understanding and agreement
     that this waiver constitutes a waiver of trial by jury of all claims,
     counterclaims and cross-claims against all parties to such actions,
     suits or proceedings, including claims, counterclaims and cross-claims
     against parties who are not parties to this Note, the Credit Agreement
     or the other Credit Documents.  This waiver is knowingly, willingly
     and voluntarily made by the Lender and the undersigned, and each of
     the Lender and the undersigned acknowledges and agrees that this
     waiver of trial by jury is a material aspect of the agreements among
     them and that no representations of fact or opinion have been made by
     any Person to induce this waiver of trial by jury or to modify, limit
     or nullify its effect.

               This Note shall be governed by, and construed and
     interpreted in accordance with, the internal laws of the State of
     Maryland, exclusive of principles of conflicts of laws.























     
<PAGE>

<PAGE>
     

               IN WITNESS WHEREOF, the undersigned has duly executed, or
     caused to be duly executed, this Note under seal the day and year
     first above written.


     ATTEST/WITNESS                AAI CORPORATION



                                   By:                                     
     -----------------------          -------------------------------------
     (SEAL)                            Name:
                                       Title:





























































     
<PAGE>

<PAGE>
     

                                                                 SCHEDULE A
                                                   to Revolving Credit Note
                                                   ------------------------

                         BASE RATE LOANS AND CONVERSIONS
                        AND REPAYMENTS OF BASE RATE LOANS
                        ---------------------------------


                     Amount of
                     Loans                     Amount of
                     Converted                 Loans
             Amount  from                      Converted   Unpaid
             of      Eurodollar                from Base   Principal
             Base    Rate        Amount of     Rate to     Balance of
             Rate    to Base     Base Rate     Eurodollar  Base
     Date    Loans   Rate        Loans Repaid  Rate        Rate Loans
     ----    -----   ----------  ------------  ----------  ----------

























































     <PAGE>

<PAGE>
     

     STATE OF _____________________,    ______________________________, SS:


               I HEREBY CERTIFY that on this _________ day of
     __________________, 1994, before me, the undersigned, a Notary Public
     of said State, personally appeared ___________________________, who
     acknowledged himself/herself to be the _____________________ of AAI
     Corporation, and that he/she, as such, being authorized so to do,
     executed the foregoing instrument for the purposes therein contained.

               WITNESS my hand and Notarial Seal.



                                                                           
                                   Notary Public

     My Commission expires:

     ______________________






















































     
<PAGE>

<PAGE>
     

                                                                  EXHIBIT G
                                                        to Credit Agreement
							-------------------

                              BORROWING CERTIFICATE


               This Certificate is made pursuant to Subsection 5.1(i) of
     the Credit Agreement of even date herewith (the "Credit Agreement")
     among AAI Corporation (the "Borrower"), the financial institutions
     parties thereto as Lenders, the financial institution party thereto as
     Issuing Bank, and First Fidelity Bank, National Association, as Agent. 
     Capitalized terms used herein without definition shall have the
     meanings assigned to such terms in the Credit Agreement.  The
     undersigned Vice President of the Borrower hereby certifies that, to
     his knowledge and belief:

               1.   The representations and warranties of the Borrower set
          forth in the Credit Agreement and the other Credit Documents, or
          which are contained in any certificate, document or financial or
          other statement furnished pursuant to or in connection with the
          Credit Agreement, are true and complete in all material respects
          on and as of the date hereof;

               2.   There are no bankruptcy, insolvency, reorganization,
          liquidation or dissolution proceedings pending or, to my
          knowledge, threatened against the Borrower or any of the
          Guarantors, nor has any other event occurred affecting or
          threatening the existence of the Borrower or any of the
          Guarantors; and

               3.   Immediately prior to and immediately after the making
          of the Revolving Credit Loans requested to be made on the date
          hereof, no Default or Event of Default will have occurred.

               4.   Attached hereto are copies of all documents and
          instruments, including all waivers, consents, licenses,
          approvals, authorizations and filings required or advisable under
          any Requirement of Law or by Contractual Obligations of the
          Borrower or any Guarantor or otherwise required in connection
          with the execution, delivery, performance, validity and
          enforceability of the Credit Agreement, the Notes, the other
          Credit Documents and the Intercreditor Agreement and such
          consents, waivers, licenses, approvals, authorizations and
          filings are in full force and effect on the date hereof.





























     
<PAGE>

<PAGE>
     

               IN WITNESS WHEREOF, the undersigned has hereunto set his
     name as of the _____ day of _________, 1994.


                                                                           
                                   Name: Richard R. Erkeneff
                                   Title:
                                   President and Chief Executive Officer


































































     
<PAGE>

<PAGE>
     

                                                                  EXHIBIT H
                                                        to Credit Agreement
							-------------------

                    (FORM OF COMMITMENT TRANSFER SUPPLEMENT)



                         COMMITMENT TRANSFER SUPPLEMENT


               THIS COMMITMENT TRANSFER SUPPLEMENT is made as of the date
     set forth in Item 1 of Schedule I hereto among the Transferor Lender
     set forth in Item 2 of Schedule I hereto (the "Transferor Lender"),
     each Purchasing Lender set forth in Item 3 of Schedule I hereto (each,
     a "Purchasing Lender"), and FIRST FIDELITY BANK, NATIONAL ASSOCIATION,
     as Agent under the Credit Agreement described below (in such capacity,
     the "Agent").

               WHEREAS, this Commitment Transfer Supplement is being
     executed and delivered in accordance with Subsection 10.12(c) of the
     Credit Agreement dated as of October 13, 1994, among AAI CORPORATION,
     a Maryland corporation (the "Borrower"), the Transferor Lender, the
     other Lenders party thereto, the Issuing Bank party thereto and the
     Agent (as amended, modified, extended, renewed, supplemented or
     replaced from time to time, the "Credit Agreement"); and
                                      ----------------
               WHEREAS, capitalized terms used herein without definition
     shall have the meanings assigned to such terms in the Credit
     Agreement; and

               WHEREAS, each Purchasing Lender (if it is not already a
     Lender party to the Credit Agreement) wishes to become a Lender party
     to the Credit Agreement; and

               WHEREAS, the Transferor Lender is selling and assigning to
     each Purchasing Lender rights, obligations and commitments under the
     Credit Agreement.

               NOW, THEREFORE, the parties hereto hereby agree as follows:

               1.   Promptly after receipt by the Agent of five
     counterparts of this Commitment Transfer Supplement, to each of which
     is attached a fully completed Schedule I and Schedule II, and each of
     which has been executed by the Transferor Lender and each




























     
<PAGE>

<PAGE>
     

     Purchasing Lender (and the Borrower, if required by the Credit
     Agreement to execute this Commitment Transfer Supplement), the Agent
     will execute each such counterpart and transmit to the Borrower, the
     Transferor Lender and each Purchasing Lender a Transfer Effective
     Notice, substantially in the form of Schedule III hereto (a "Transfer
     Effective Notice").  Such Transfer Effective Notice shall set forth,
     inter alia, the date on which the transfer effected by this Commitment
     ----- ----
     Transfer Supplement shall become effective (the "Transfer Effective
     Date"), which date shall be the fifth Business Day following the date
     of such Transfer Effective Notice.  From and after the Transfer
     Effective Date, each Purchasing Lender shall be a Lender party to the
     Credit Agreement for all purposes thereof.

               2.   At or before 12:00 Noon, local time of the Transferor
     Lender, on the Transfer Effective Date, each Purchasing Lender shall
     pay to the Transferor Lender, in immediately available funds, an
     amount equal to the purchase price, as agreed between the Transferor
     Lender and such Purchasing Lender (the "Purchase Price"), of the
     portion being purchased by such Purchasing Lender (such Purchasing
     Lender's "Purchased Percentage") of the outstanding Revolving Credit
     Loans, participations in Letters of Credit and other amounts owing to
     the Transferor Lender under the Credit Agreement and the other Credit
     Documents.  Effective upon receipt by the Transferor Lender of the
     Purchase Price from a Purchasing Lender, the Transferor Lender hereby
     irrevocably sells, assigns and transfers to such Purchasing Lender,
     without recourse, representation or warranty, and each Purchasing
     Lender hereby irrevocably purchases, takes and assumes from the
     Transferor Lender, such Purchasing Lender's Purchased Percentage of
     the Revolving Credit Commitment of the Transferor Lender and the
     presently outstanding Revolving Credit Loans, participations in
     Letters of Credit and other amounts owing to the Transferor Lender
     under the Credit Agreement and the other Credit Documents.

               3.   The Transferor Lender has made arrangements with each
     Purchasing Lender with respect to (i) the portion, if any, to be paid,
     and the date or dates for payment, by the Transferor Lender to such
     Purchasing Lender of any fees heretofore received by the Transferor
     Lender pursuant to the Credit Agreement prior to the Transfer
     Effective Date and (ii) the portion, if any, to be paid, and the date
     or dates for payment, by such Purchasing Lender to the Transferor
     Lender of fees or interest received by such Purchasing Lender pursuant
     to the Credit Agreement from and after the Transfer Effective Date.

               4.   (a)  All principal payments that would otherwise be
     payable from and after the Transfer Effective Date to or for the
     account of the Transferor Lender pursuant to the Credit Agreement and
     the other Credit Documents shall, instead, be payable to or for the
     account of the Transferor Lender and the Purchasing Lenders, as the
     case may be, in
























     
<PAGE>

<PAGE>
     

     accordance with their respective interests as reflected in this
     Commitment Transfer Supplement.

                    (b)  All interest, fees and other amounts that would
     otherwise accrue for the account of the Transferor Lender from and
     after the Transfer Effective Date pursuant to the Credit Agreement and
     the other Credit Documents shall, instead, accrue for the account of,
     and be payable to, the Transferor Lender and the Purchasing Lenders,
     as the case may be, in accordance with their respective interests as
     reflected in this Commitment Transfer Supplement.  In the event that
     any amount of interest, fees or other amounts accruing prior to the
     Transfer Effective Date was included in the Purchase Price paid by any
     Purchasing Lender, the Transferor Lender and each Purchasing Lender
     will make appropriate arrangements for payment by the Transferor
     Lender to such Purchasing Lender of such amount upon receipt thereof
     from the Borrower.

               5.   On or prior to the Transfer Effective Date, the
     Transferor Lender will deliver to the Agent its Revolving Credit Note. 
     On or prior to the Transfer Effective Date, the Borrower will execute
     and deliver to the Agent a Revolving Credit Note for each Purchasing
     Lender and the Transferor Lender, in each case in principal amounts
     reflecting, in accordance with the Credit Agreement, their Revolving
     Credit Commitments (as adjusted pursuant to this Commitment Transfer
     Supplement).  Each such new Revolving Credit Note shall be dated the
     Closing Date.  Promptly after the Transfer Effective Date, the Agent
     will send to each of the Transferor Lender and the Purchasing Lenders
     its new Revolving Credit Note and will send to the Borrower the
     superseded Revolving Credit Note of the Transferor Lender, marked
     "Cancelled."

               6.   Concurrently with the execution and delivery hereof,
     the Transferor Lender will provide, at its sole expense, to each
     Purchasing Lender (if it is not already a Lender party to the Credit
     Agreement) conformed copies of all documents delivered to such
     Transferor Lender on the Closing Date in satisfaction of the
     conditions precedent set forth in the Credit Agreement.

               7.   Each of the parties to this Commitment Transfer
     Supplement agrees that, at any time and from time to time upon the
     written request of any other party, it will execute and deliver such
     further documents and do such further acts and things as such other
     party may reasonably request in order to effect the purposes of this
     Commitment Transfer Supplement.

               8.   By executing and delivering this Commitment Transfer
     Supplement, the Transferor Lender and each Purchasing Lender confirm
     to and agree with each other, the Agent and the Lenders as follows:
     (i) other than the representation and warranty that it is the

























     
<PAGE>

<PAGE>
     

     legal and beneficial owner of the interest being assigned hereby free
     and clear of any adverse claim, the Transferor Lender makes no
     representation or warranty and assumes no responsibility with respect
     to any statements, warranties or representations made in or in
     connection with the Credit Agreement or the other Credit Documents or
     the execution, legality, validity, enforceability, genuineness,
     sufficiency or value of the Credit Agreement or any other Loan
     Document; (ii) the Transferor Lender makes no representation or
     warranty and assumes no responsibility with respect to the financial
     condition of the Borrower or any Other Obligor or the performance or
     observance by the Borrower or any Other Obligor of any of its
     obligations under the Credit Agreement or any other Loan Document;
     (iii) each Purchasing Lender confirms that it has received a copy of
     the Credit Agreement, together with copies of the financial statements
     referred to in Subsection 4.1 of the Credit Agreement, the financial
     statements delivered pursuant to Subsection 6.1 of the Credit
     Agreement, if any, and such other documents and information as it has
     deemed appropriate to make its credit analysis and decision to enter
     into this Commitment Transfer Supplement; (iv) each Purchasing Lender
     will, independently and without reliance upon the Agent, the
     Transferor Lender, any other Lender or the Issuing Bank and based on
     such documents and information as it shall deem appropriate at the
     time, continue to make its own credit decisions in taking or not
     taking action under the Credit Agreement or other Credit Documents;
     (v) each Purchasing Lender appoints and authorizes the Agent to take
     such actions as Agent on its behalf and to exercise such powers under
     the Credit Agreement and the other Credit Documents as are delegated
     to the Agent by the terms thereof, together with such powers as are
     reasonably incidental thereto, all in accordance with Section 9 of the
     Credit Agreement; and (vi) each Purchasing Lender agrees that it will
     perform in accordance with their terms all of the obligations which by
     the terms of the Credit Agreement or other Credit Documents are
     required to be performed by it as a Lender.

               9.   Schedule II hereto sets forth the revised Revolving
     Credit Commitments and Commitment Percentages of the Transferor Lender
     and each Purchasing Lender, as well as administrative information with
     respect to each Purchasing Lender.

               10.  Each Purchasing Lender hereby acknowledges and consents
     to, and agrees to be bound by, the Intercreditor Agreement.  This
     paragraph 10 is for the benefit of the Private Placement Debt Holders
     and the Transferor Lender.

               11.  THIS COMMITMENT TRANSFER SUPPLEMENT SHALL BE GOVERNED
     BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE INTERNAL
     LAWS OF THE STATE OF MARYLAND, EXCLUSIVE OF PRINCIPLES OF CONFLICTS OF
     LAWS.


























     
<PAGE>

<PAGE>
     

               IN WITNESS WHEREOF, the parties hereto have caused this
     Commitment Transfer Supplement to be executed and delivered by their
     respective duly authorized officers on Schedule I hereto as of the
     date set forth in Item 1 of Schedule I hereto.
     CONSENTED TO AND ACKNOWLEDGED:

     AAI CORPORATION



     By:________________________
        Name:
        Title:


     [Consent required only when 
     Purchasing Lender is not already 
     a Lender or Affiliate thereof]
























































     
<PAGE>

<PAGE>
     

                                                                 SCHEDULE I
                                                              TO COMMITMENT
                                                                   TRANSFER
                                                                 SUPPLEMENT
                                                                 ----------

                          COMPLETION OF INFORMATION AND
                            SIGNATURES FOR COMMITMENT
                               TRANSFER SUPPLEMENT       
                        ---------------------------------

               Re:  Credit Agreement dated October 13, 1994
                    with AAI Corporation


      Item 1         Date of Commitment       [Insert date of
                     Transfer Supplement:     Commitment Transfer
                                              Supplement]

      Item 2         Transferor Lender:       [Insert name of
                                              Transferor Lender]
      Item 3         Purchasing Lender[s]:    [Insert name[s] of
                                              Purchasing Lender[s]]

      Item 4         Signatures of Parties
                     to Commitment Transfer
                     Supplement:


                                                                       , as
                                        -------------------------------
                                        Transferor Lender


                                        By:                                
                                           --------------------------------
                                          Name:
                                          Title:




































     
<PAGE>

<PAGE>
     

     [SIGNATURES CONTINUED]



                                                                     , as a
                                        -----------------------------
                                        Purchasing Lender


                                        By:                                
                                           --------------------------------
                                          Name:
                                          Title:


                                                                 , as Agent
                                        -------------------------

                                        By:                                
                                           --------------------------------
                                          Name:
                                          Title:




















































     
<PAGE>

<PAGE>
     

                                                                SCHEDULE II
                                                              TO COMMITMENT
                                                                   TRANSFER
                                                                 SUPPLEMENT
                                                                 ----------

                       LIST OF LENDING OFFICES, ADDRESSES
                       FOR NOTICES AND COMMITMENT AMOUNTS
                       ----------------------------------


      [Name of Transferor
        Lender]            Revised Revolving Credit        $         
                           ------------------------         ---------
                           Commitment Amount:

                           Revised Commitment Percentage:            
                           ------------------------------   ---------

      [Name of Purchasing  New Revolving Credit            $         
        Lender]            --------------------             ---------
                           Commitment Amount:

                           New Commitment Percentage:                
                           --------------------------       ---------



     Address for Notices to Purchasing Lender:
     ----------------------------------------
                                                                
     -----------------------------------------------------------
                                                                
     -----------------------------------------------------------
                                                                
     -----------------------------------------------------------

     Eurodollar Lending Office of Purchasing Lender:
     ----------------------------------------------
                                                                
     -----------------------------------------------------------
                                                                
     -----------------------------------------------------------
                                                                
     -----------------------------------------------------------

     Domestic Lending Office of Purchasing Lender:
     --------------------------------------------
                                                                
     -----------------------------------------------------------

























     <PAGE>

<PAGE>
     

                                                               SCHEDULE III
                                                              TO COMMITMENT
                                                                   TRANSFER
                                                                 SUPPLEMENT
                                                                 ----------

                       [Form of Transfer Effective Notice]

     To:  AAI CORPORATION, [Transferor Lender
          and each Purchasing Lender]


               The undersigned, as Agent under the Credit Agreement dated
     as of October 13, 1994, among AAI CORPORATION (the "Borrower"), the
     Lenders parties thereto, the Issuing Bank party thereto and the
     undersigned, as such Agent, acknowledges receipt of five executed
     counterparts of a completed Commitment Transfer Supplement, as
     described in Schedule I hereto.  [Note: attach copy of Schedule I from
     Commitment Transfer Supplement.]  Terms defined in such Commitment
     Transfer Supplement are used herein as therein defined.

               1.   Pursuant to such Commitment Transfer Supplement, you
     are advised that the Transfer Effective Date will be
                          [Insert fifth Business Day following date of
     --------------------
     Transfer Effective Notice].

               2.   Pursuant to such Commitment Transfer Supplement, the
     Transferor Lender is required to deliver to the Agent on or before the
     Transfer Effective Date its Revolving Credit Note.

               3.   Pursuant to such Commitment Transfer Supplement, the
     Borrower is required to deliver to the Agent on or before the Transfer
     Effective Date the following Revolving Credit Notes, each dated
     [                            , 1994]:
      ----------------------------------
               [Describe each new Revolving Credit Note for Transferor
               Lender and each Purchasing Lender as to principal
               amount and payee]




































     <PAGE>

<PAGE>
     

               4.   Pursuant to such Commitment Transfer Supplement, each
     Purchasing Lender is required to pay its Purchase Price to the
     Transferor Lender at or before 12:00 Noon on the Transfer Effective
     Date in immediately available funds.


                                   Very truly yours,

                                   FIRST FIDELITY BANK, NATIONAL
                                     ASSOCIATION, as Agent


                                   By:                                     
                                      -------------------------------------
                                     Name:
                                     Title:


                                   By:                                     
                                      -------------------------------------
                                     Name:
                                     Title:
























































<PAGE>




     PLEDGE AND SECURITY AGREEMENT


               THIS AGREEMENT is made as of the ________ day of
     _______________, 1994, by and between FIRST FIDELITY BANK, NATIONAL
     ASSOCIATION, as Agent (in such capacity, "Secured Party") for the
     Lenders, the Issuing Bank and the Noteholders (as those terms are
     hereinafter defined), and AAI CORPORATION, a Maryland corporation
     ("Debtor").


              SECTION 1.  CONSTRUCTION OF AGREEMENT AND DEFINITIONS


     Unless the context otherwise requires, all of the terms used herein
     without definition which are defined by the Maryland Uniform
     Commercial Code shall have the meanings assigned to them by the
     Maryland Uniform Commercial Code except to the extent varied by this
     Agreement.  Unless the context otherwise requires, all capitalized
     terms hereinbefore or hereinafter used in this Agreement without
     definition shall have the meanings assigned to such terms in the
     Credit Agreement.  The phrases "satisfactory to Secured Party,"
     "acceptable to Secured Party" and similar phrases shall mean
     satisfactory or acceptable to Secured Party, in Secured Party's
     discretion exercised in good faith.  The use of the singular herein
     shall also refer to the plural and vice versa, and the use herein of
     any gender, including the neuter, shall also refer to each of the
     other genders, including the neuter.  The captions and headings
     contained in this Agreement are for convenience of reference only and
     shall not affect the meaning, or the construction or interpretation,
     of this Agreement.  In addition to terms defined elsewhere in this
     Agreement, the following terms shall have the following meanings when
     used herein:

               "CARSHELL" shall mean AAI California Carshell, Inc., a
     Maryland corporation.

               "CARSHELL SECURITIES" shall mean the shares of capital stock
     of Carshell identified on the Securities Exhibit attached to this
     Agreement and incorporated by reference into this Agreement, and all
     other shares of capital stock and other securities of Carshell, now
     owned or hereafter acquired by Debtor.

               "COLLATERAL" shall mean:  (a) the Securities Collateral; and
     (b) all of Debtor's present and future books and records in any form
     relating to the Securities Collateral, in or on any media, including
     data processing materials in any form (including software, tapes,
     disks and the like), whether in the possession of Debtor or any other
     person.

               "CREDIT AGREEMENT" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Credit Agreement of even date herewith
     among Debtor, Secured Party, Lenders and Issuing Bank.
<PAGE>

<PAGE>




               "DEBTOR NOTICE ADDRESS" shall mean York Road and Industry
     Lane, Hunt Valley, Maryland 21030.

               "ENGINEERING" shall mean AAI Engineering Support Inc., a
     Maryland corporation.

               "ENGINEERING SECURITIES" shall mean the shares of capital
     stock of Engineering identified on the Securities Exhibit attached to
     this Agreement and incorporated by reference into this Agreement, and
     all other shares of capital stock of Engineering and other securities
     of Engineering, now owned or hereafter acquired by Debtor.

               "EVENT OF DEFAULT" shall mean an "Event of Default," as
     defined in the Credit Agreement, or an "Event of Default," as defined
     in the Note Purchase Agreement.

               "GOOD FAITH" shall mean, with respect to a determination,
     request or other action to be made or taken by Secured Party "in good
     faith," that Secured Party shall make or take such determination,
     request or other action honestly and not maliciously.

               "INTERCREDITOR AGREEMENT" shall mean, as the same may be
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Intercreditor Agreement of even date
     herewith among Secured Party, Lenders, Issuing Bank and Noteholders.

               "INTERNATIONAL" shall mean AAI International, Inc., a
     Delaware corporation.

               "INTERNATIONAL SECURITIES" shall mean the shares of capital
     stock of International identified on the Securities Exhibit attached
     to this Agreement and incorporated by reference into this Agreement,
     and all other shares of capital stock and other securities of
     International, now owned or hereafter acquired by Debtor.

               "ISSUING BANK" shall mean the person from time to time party
     to the Credit Agreement as "Issuing Bank."

               "LENDER DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, the Credit Agreement, the Revolving Credit Notes, the
     Borrower Security Agreement, the Deed of Trust, the Guaranty, the
     Guarantor Security Agreement, the UIC Pledge Agreement, the UIC
     Subordination Agreement, the UIC-DEL Subordination Agreement, the L/C
     Agreements, this Agreement, and any and all other agreements,
     contracts, promissory notes and other instruments, security
     agreements, assignments, pledge agreements, indemnification
     agreements, mortgages, deeds of




















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<PAGE>

<PAGE>




     trust, leases, guaranties and other documents now or hereafter
     existing and evidencing, securing (directly or indirectly),
     guaranteeing (or in effect guaranteeing) or indemnifying (or in effect
     indemnifying) any of Lenders or Issuing Bank with respect to, any of
     the aforementioned documents or any obligations of any person to any
     of Lenders or Issuing Bank thereunder.

               "LENDER OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, refinanced,
     consolidated or replaced from time to time, all present and future
     Revolving Credit Loans, L/C Reimbursement Obligations and other
     obligations, indebtedness and liabilities of Debtor to each of Lenders
     and Issuing Bank arising under, evidenced by or in connection with the
     Credit Agreement or the other Lender Documents, including, without
     limitation, all principal amounts, including future advances,
     indemnification obligations, interest charges, fees, premiums,
     commissions and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Debtor under or in connection with the Credit
     Agreement or the other Lender Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing, and including, without limitation, all claims
     against Debtor arising or re-arising on account of or as a result of
     any payment made by Debtor or any other person with respect to any
     obligations included in this definition which is rescinded or
     recovered from any of Lenders or Issuing Bank or restored or returned
     by any of Lenders or Issuing Bank under authority of any law, rule,
     regulation, order of court or Governmental Authority, or in connection
     with any compromise or settlement relating thereto or relating to any
     pending or threatened action, suit or proceeding relating thereto,
     whether arising out of any proceedings under the United States
     Bankruptcy Code or otherwise.  

               "LENDERS" shall mean the persons from time to time parties
     to the Credit Agreement as "Lenders."

               "MEDICAL" shall mean AAI Medical Corporation, a Maryland
     corporation.

               "MEDICAL SECURITIES" shall mean the shares of capital stock
     of Medical identified on the Securities Exhibit attached to this
     Agreement and incorporated by reference into this Agreement, and all
     other shares of capital stock and other securities of Medical, now
     owned or hereafter acquired by Debtor.

               "MICROFLITE" shall mean AAI Microflite Simulation
     International Corporation, a Maryland corporation.



















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<PAGE>

<PAGE>




               "MICROFLITE SECURITIES" shall mean the shares of capital
     stock of Microflite identified on the Securities Exhibit attached to
     this Agreement and incorporated by reference into this Agreement, and
     all other shares of capital stock and other securities of Microflite,
     now owned or hereafter acquired by Debtor.

               "NOTE PURCHASE AGREEMENT" shall mean, as the same has been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Note Purchase
     Agreement dated July 15, 1992, among Debtor and Noteholders.

               "NOTEHOLDER DOCUMENTS" shall mean, as the same have been or
     may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, the Note Purchase
     Agreement, the Noteholder Notes, the UIC Noteholder Guaranty and any
     and all other agreements, contracts, promissory notes and other
     instruments, security agreements, assignments, pledge agreements,
     indemnification agreements, mortgages, deeds of trust, leases,
     guaranties and other documents now or hereafter existing and
     evidencing, securing, directly or indirectly, guaranteeing (or in
     effect guaranteeing) or indemnifying (or in effect indemnifying)
     Noteholders with respect to, any of the aforementioned documents or
     any obligations of any person to Noteholders thereunder.

               "NOTEHOLDER NOTES" shall mean, as the same have been or may
     hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain 8.65% Senior
     Note Due July 31, 1999, dated August 11, 1992, issued by Debtor to
     TRAL & CO, nominee of The Travelers Insurance Company, pursuant to the
     Note Purchase Agreement in the original principal amount of
     $9,000,000.00, that certain 8.65% Senior Note Due July 31, 1999, dated
     August 11, 1992, issued by Debtor to TRAL & CO, nominee of The
     Travelers Indemnity Company of Rhode Island, pursuant to the Note
     Purchase Agreement in the original principal amount of $3,000,000.00
     and assigned by The Travelers Indemnity Company of Rhode Island to The
     Travelers Insurance Company, that certain 8.65% Senior Note Due
     July 31, 1999, dated August 11, 1992, issued by Debtor to Principal
     Mutual Life Insurance Company pursuant to the Note Purchase Agreement
     in the original principal amount of $10,000,000.00, and that certain
     8.65% Senior Note Due July 31, 1999, dated August 11, 1992, issued by
     Debtor to Principal Mutual Life Insurance Company pursuant to the Note
     Purchase Agreement in the original principal amount of $3,000,000.00.

               "NOTEHOLDER OBLIGATIONS" shall mean, as the same have been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented, refinanced, consolidated or replaced from time to time,
     all present and future obligations, indebtedness





















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<PAGE>

<PAGE>




     and liabilities of Debtor to each of Noteholders arising under,
     evidenced by  or in connection with the Noteholder Documents,
     including, without limitation, principal amounts (but not including
     any additional loans or advances by Noteholders to Debtor), interest
     charges, fees, premiums and all other charges and sums, as well as all
     costs and expenses, including reasonable attorneys' fees and expenses,
     payable or reimbursable by Debtor to each of Noteholders under or in
     connection with the Noteholder Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing and including, without limitation, all claims
     against Debtor arising or re-arising on account of or as a result of
     any payment made by Debtor or any other person with respect to any
     obligations included in this definition which is rescinded or
     recovered from any of Noteholders or restored or returned by any of
     Noteholders under authority of any law, rule, regulation, order of
     court or Governmental Authority, or in connection with any compromise
     or settlement relating thereto or relating to any pending or
     threatened action, suit or proceeding relating thereto, whether
     arising out of any proceedings under the United States Bankruptcy Code
     or otherwise.  

               "NOTEHOLDERS" shall mean, collectively, Principal Mutual
     Life Insurance Company, an Iowa corporation, and The Travelers
     Insurance Company, a Connecticut corporation.

               "PERSON" shall mean any individual, corporation, limited
     liability company, partnership, joint venture, association, trust,
     business trust, Governmental Authority (or subdivision, agency or
     department thereof) or other entity of any kind.

               "SECURED OBLIGATIONS" shall mean, collectively, the Lender
     Obligations and the Noteholder Obligations.

               "SECURED PARTY NOTICE ADDRESS" shall mean 123 South Broad
     Street, Philadelphia, Pennsylvania 19109.

               "SECURITIES" shall mean the Carshell Securities, the
     Engineering Securities, the International Securities, the Medical
     Securities, the Microflite Securities, the Seti Securities, the
     Systems Securities and the Technologies Securities.

               "SECURITIES CERTIFICATES" shall mean the certificates
     evidencing the Securities identified on the Securities Exhibit
     attached to this Agreement and incorporated by reference into this
     Agreement.

               "SECURITIES COLLATERAL" shall mean:  (a) all present and
     future rights, titles and interests of Debtor in, to and


















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<PAGE>

<PAGE>




     under the Securities; (b) all present and future rights, titles,
     interests, powers, authorities, options, warrants, privileges and
     benefits of, accruing to or in any way relating to the Securities;
     (c) all present and future rights, titles and interests of Debtor in,
     to and under the Securities Documents and any oral agreements which,
     if written, would constitute Securities Documents, and all present and
     future rights, titles, interests, powers, authorities, options,
     warrants, privileges and benefits of Debtor arising under or in
     connection with the Securities Documents or any such oral agreements;
     (d) all present and future rights and claims of Debtor to the payment
     or receipt of money and other property of every kind for any reason
     arising under, on account of, in respect of, in evidence of, as an
     addition to, in substitution for, in replacement of, in exchange for,
     or in any other manner relating to, the Securities, the Securities
     Documents or any such oral agreements, whether in connection with any
     merger, consolidation, reorganization, recapitalization,
     reclassification, stock split, liquidation, increase or reduction of
     capital or other similar occurrence in respect of any of the
     Securities Issuers, or otherwise; (e) all present and future rights,
     titles and interests of Debtor in and to all present and future
     payments, receipts, collections, profits, revenues, dividends
     (including, without limitation, stock dividends, cash dividends and
     liquidating dividends), distributions, surplus, income, settlements,
     exchanges, benefits and other proceeds and avails in every form of or
     in any way relating to, the Securities, the Securities Documents or
     any such oral agreements, including, without limitation, all present
     and future rights and claims of Debtor to the payment or receipt of
     money and other property of every kind for any reason arising on
     account of or in any way relating to, and all present and future
     rights, titles and interests of Debtor in and to all proceeds in every
     form of, any voluntary or involuntary purchase, sale, transfer,
     conveyance, assignment, redemption, encumbrance, financing, re-
     financing, recapitalization, reorganization, exchange, liquidation,
     condemnation, taking, theft or disposition of any nature of, or any
     damage or casualty to, or any loss with respect to, the Securities,
     the Securities Documents, any such oral agreements or any of the
     Securities Issuers; and (f) all present and future proceeds of all of
     the foregoing, including, without limitation, cash proceeds, non-cash
     proceeds and proceeds acquired with cash proceeds, whether any such
     proceeds constitute consumer goods, farm products, equipment,
     inventory, documents of title, chattel paper, accounts, instruments or
     general intangibles, and including, without limitation, all proceeds
     of insurance policies insuring any of the foregoing or any risks
     relating to any of the foregoing.

               "SECURITIES DOCUMENTS" shall mean, as the same may be
     waived, amended, modified, extended, renewed, supplemented or replaced
     from time to time, the Securities Certificates and all other present
     and future certificates, agreements, contracts,



















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<PAGE>

<PAGE>




     instruments and other documents and writings evidencing or in any way
     relating to the Securities or any rights, titles, interests, powers,
     authorities, options, warrants, privileges or benefits of, accruing to
     or in any way relating to the Securities, including, without
     limitation, any such documents and writings in any way relating to the
     purchase, sale, transfer, conveyance, assignment, redemption,
     encumbrance, financing, re-financing, exchange, liquidation or
     disposition of any nature of, the Securities or any rights, titles,
     interests, powers, authorities, options, warrants, privileges or
     benefits of, accruing to or in any way relating to the Securities.

               "SECURITIES ISSUERS" shall mean Carshell, Engineering,
     International, Medical, Microflite, Seti, Systems and Technologies.

               "SETI" shall mean Seti, Inc., a Pennsylvania corporation.

               "SETI SECURITIES" shall mean the shares of capital stock of
     Seti identified on the Securities Exhibit attached to this Agreement
     and incorporated by reference into this Agreement, and all other
     shares of capital stock of Seti and other securities of Seti, now
     owned or hereafter acquired by Debtor.

               "SYSTEMS" shall mean AAI Systems Management, Inc., a
     Maryland corporation.

               "SYSTEMS SECURITIES" shall mean the shares of capital stock
     of Systems identified on the Securities Exhibit attached to this
     Agreement and incorporated by reference into this Agreement, and all
     other shares of capital stock and other securities of Systems, now
     owned or hereafter acquired by Debtor.

               "TECHNOLOGIES" shall mean AAI/ACL Technologies, Inc., a
     Maryland corporation.

               "TECHNOLOGIES SECURITIES" shall mean the shares of capital
     stock of Technologies identified on the Securities Exhibit attached to
     this Agreement and incorporated by reference into this Agreement and
     all other shares of capital stock and other securities of
     Technologies, now owned or hereafter acquired by Debtor.

               "UIC NOTEHOLDER GUARANTY" shall mean, as the same has been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Guaranty
     Agreement dated July 15, 1992, executed and delivered by UIC in favor
     of Noteholders.























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                  SECTION 2.  SECURITY INTEREST AND COLLATERAL


     2.1Grant of Security Interest.  As security for the Secured
        --------------------------
     Obligations, Debtor hereby grants to Secured Party, for the ratable
     benefit of Lenders, Issuing Bank and Noteholders according to the
     provisions of this Agreement and the Intercreditor Agreement, a lien
     and continuing security interest in, and pledges and assigns to
     Secured Party, for the ratable benefit of Lenders, Issuing Bank and
     Noteholders according to the provisions of this Agreement and the
     Intercreditor Agreement, the Collateral.  Even if any of the Secured
     Obligations shall at any time or from time to time be paid in full,
     Secured Party's security interest shall continuously exist until all
     of the Lender Obligations have been paid in full and there exists no
     commitment by any of Lenders or Issuing Bank which could give rise to
     any Lender Obligations.

               2.2 Additional Documents.  Debtor agrees to execute and
                   --------------------
     deliver to Secured Party, or cause to be executed and delivered to
     Secured Party, from time to time promptly after request by Secured
     Party and in form and content satisfactory to Secured Party, such
     security agreements, financing statements, amendments of financing
     statements, assignments of financing statements, security interest
     filing statements, mortgages, deeds of trust, assignments, notices,
     consents and other documents as Secured Party may request in good
     faith in order to confirm, supplement, preserve, protect or perfect,
     or to maintain the perfection of, Secured Party's security interest in
     the Collateral and Secured Party's rights under this Agreement.

               2.3  Representations and Warranties Concerning Collateral. 
                    ----------------------------------------------------
     Debtor represents and warrants that:  (a) no assignments of any of the
     Collateral have previously been made, and no financing statement,
     mortgage, deed of trust, assignment, notice of lien or other security
     document publicizing a security interest in or lien upon any of the
     Collateral is or will be on file in any recording or filing office,
     and the Collateral is and shall remain free and clear of all liens,
     security interests, assignments and encumbrances of every kind except
     as created hereby; and (b) Debtor is the legal and beneficial owner of
     all of the Collateral.

               2.4  Representations and Warranties Concerning Securities
                    ----------------------------------------------------
     Issuers and Securities Documents.  Debtor represents and warrants
     --------------------------------
     that:  (a) the execution, delivery and performance of this Agreement
     will not violate any term, provision or requirement of the articles of
     incorporation, corporate charter or bylaws of any of the Securities
     Issuers or any material instrument, contract, agreement, indenture,
     mortgage, deed of trust or other document or obligation to which any
     of the Securities Issuers is a party or by which any of the Securities















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     Issuers, or any of their property, is bound; (b) there are presently
     no Securities Documents except for the Securities Certificates;
     (c) the Securities evidenced by the Securities Certificates have been
     duly issued to Debtor and are fully paid and non-assessable; (d) none
     of the Securities constitute "margin stock," as defined in Regulation
     U of the Board of Governors of the Federal Reserve System; and
     (e) there are outstanding no options, warrants, convertible debt
     instruments or other similar instruments issued by any of the
     Securities Issuers conferring on any person any contingent or
     noncontingent rights to acquire any capital stock of any of the
     Securities Issuers.

               2.5  Additional Warranties and Agreements Concerning
                    -----------------------------------------------
     Collateral.  Debtor warrants and agrees that:  (a) Debtor will
     ----------
     promptly deliver to Secured Party, with such indorsements, powers
     and/or assignments as Secured Party may from time to time request in
     good faith, all Securities Documents now or hereafter in Debtor's
     possession or control; (b) except for cash dividends received by
     Debtor on account of the Securities at a time when no Event of Default
     shall be continuing (not including cash dividends in connection with
     the dissolution, liquidation or sale of any of the Securities Issuers 
     or any property of any of the Securities Issuers), Secured Party shall
     have the right to receive, and Debtor shall promptly deliver, or cause
     to be delivered promptly, to Secured Party and, until so delivered,
     Debtor shall hold as Secured Party's agent and bailee, all money and
     other property in any form and for any reason paid, payable,
     distributed or distributable to Debtor, or received or receivable by
     Debtor, on account of or in respect of, or constituting, Collateral,
     with such indorsements and/or assignments as Secured Party may from
     time to time request; (c) all Collateral delivered to Secured Party or
     coming into Secured Party's possession or control from time to time
     may be held by Secured Party as security for the Secured Obligations;
     (d) Secured Party shall have the right, in its discretion, at any time
     and from time to time (i) to sign Debtor's name on any drafts or
     orders against, or demands, notices or other documents directed to,
     persons obligated or liable to Debtor on account of or in respect of
     any of the Collateral, (ii) to indorse Debtor's name on any
     instruments, checks, drafts, orders or other items of payment
     constituting Collateral that may come into Secured Party's possession
     or control from time to time, and/or (iii) to cause, or to require
     Debtor to cause, any of the Collateral to be registered in the name of
     Secured Party or its nominees; (e) no check, draft, money order or
     other item of payment received by Secured Party or applied on account
     of any of the Secured Obligations shall constitute a final payment to
     Secured Party unless and until the item of payment shall be honored
     and finally paid to Secured Party in immediately available funds;
     (f) except as otherwise specifically permitted by this Agreement,
     Debtor will not, directly or indirectly, without Secured Party's prior
     written consent, sell, assign, transfer, convey or otherwise

















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     dispose of, or suffer or permit to occur any sale, assignment,
     transfer, conveyance or disposition of, any of the Collateral, or any
     interest therein; and (g) except as otherwise specifically permitted
     by this Agreement, Debtor will not, without Secured Party's prior
     written consent, exercise or waive, or permit the waiver or loss of,
     any rights of Debtor with respect to any of the Collateral.






























































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                               SECTION 3.  DEFAULT


     3.1Remedies.  Upon and at any time after the occurrence and during the
        --------
     continuance of any Event of Default, Secured Party may, without notice
     or demand, exercise in any jurisdiction in which enforcement hereof is
     sought, the following rights and remedies, in addition to the other
     rights and remedies available to Secured Party, Lenders, Issuing Bank
     and Noteholders under the Lender Documents and the Noteholder
     Documents, the rights and remedies of a secured party under the
     Uniform Commercial Code and all other rights and remedies available to
     Secured Party under law, all such rights and remedies being cumulative
     and enforceable alternatively, successively or concurrently: 
     (a) notify, and/or require Debtor to notify, any or all of the
     Securities Issuers and any or all other persons obligated or liable on
     or with respect to any of the Securities Collateral to deliver to
     Secured Party promptly all money and other property in any form and
     for any reason payable or distributable to Debtor, or receivable by
     Debtor, on account of or in respect of, or constituting, Securities
     Collateral; (b) in the place and stead of Debtor as though Secured
     Party were the absolute owner thereof, exercise any and all voting
     rights pertaining to the Securities Collateral and exercise any and
     all rights of conversion, exchange or subscription, and all other
     privileges, options and rights pertaining to the Securities
     Collateral, whether in connection with any merger, consolidation,
     insolvency, reorganization, recapitalization, dissolution, liquidation
     or other similar occurrence in respect of any of the Securities
     Issuers or otherwise, and, in connection therewith, to deposit and
     deliver any or all of the Securities Collateral to or with any
     committee, depository, transfer agent, registrar or other person upon
     such terms and conditions as Secured Party may determine in its
     discretion; (c) take exclusive possession of any or all of the
     Collateral from time to time and, so far as Debtor may give authority
     therefor, enter upon any premises on which any of the Collateral may
     be situated and remove the same therefrom, Debtor hereby waiving any
     and all rights to prior notice and to judicial hearing with respect to
     repossession of Collateral, and/or require Debtor, at Debtor's
     expense, to assemble and deliver any or all of the Collateral to such
     place or places as Secured Party may reasonably request; and
     (d) enforce the liens and security interests granted to Secured Party
     hereunder by collecting or liquidating all or any part of the
     Collateral or selling, assigning, re-assigning or otherwise disposing
     of all or any part of the Collateral or any interest therein, in one
     or more parcels, at the same or different times, at public or private
     sale or disposition, or otherwise.

               3.2  Collateral Dispositions.  Debtor agrees that commercial
                    -----------------------
     reasonableness and good faith require Secured Party to give Debtor no
     more than ten (10) days prior written notice of

















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     the time and place of any public disposition of Collateral or of the
     time after which any private disposition or any other intended
     disposition is to be made.  All sales or other dispositions of
     Collateral may be made for cash, upon credit or for future delivery. 
     Debtor acknowledges and agrees that Secured Party may, in its
     discretion, elect to dispose of the Securities after the occurrence
     and during the continuance of an Event of Default by causing any of
     the Securities Issuers to dissolve, liquidate and make liquidating
     dividends or distributions, and that such means of disposing of the
     Securities is commercially reasonable.  In no event shall Debtor be
     credited with any part of the proceeds of liquidation, sale or other
     disposition of any Collateral until final payment thereon has been
     received by Secured Party in immediately available funds, and Secured
     Party shall have no obligation to delay any liquidation, sale or other
     disposition because the same may result in the imposition of any
     forfeiture, premium or penalty.  In connection with any enforcement by
     Secured Party of the liens and security interests granted to Secured
     Party pursuant to this Agreement, Secured Party may demand,
     compromise, collect, enforce and sue for all money and other property
     in any form and for any reason payable or distributable to Debtor, or
     receivable by Debtor, on account of or in respect of, or constituting,
     Collateral, and otherwise exercise all rights of Debtor with respect
     to the Collateral, and all Collateral or proceeds of Collateral
     delivered to Secured Party or coming into Secured Party's possession
     or control from time to time may be applied by Secured Party from time
     to time, in whole or in part and in such order as Secured Party may
     determine in its discretion, to any of the Secured Obligations. 
     Debtor covenants and agrees, at Debtor's expense, to execute and
     deliver or cause to be executed and delivered, and to do or cause to
     be done, all such acts, things, instruments and documents as may, in
     the opinion of Secured Party or counsel to Secured Party, be necessary
     or advisable to make all sales and dispositions of Collateral valid,
     binding and enforceable and in compliance with all applicable laws,
     rules and regulations and all judgments, orders, awards, decrees,
     writs and injunctions of all courts, arbitrators or governmental
     authorities having jurisdiction over any such sales or dispositions. 
     Debtor acknowledges and agrees that a breach of any of the covenants
     contained in this Subsection or in Subsection 3.3 will cause
     irreparable injury to Secured Party and that Secured Party has no
     adequate remedy at law in respect of any such breach.  Debtor
     therefore acknowledges and agrees that each and every covenant
     contained in this Subsection and in Subsection 3.3 shall be
     specifically enforceable against Debtor, and Debtor hereby waives to
     the extent permitted by applicable law, and agrees not to assert, any
     defenses against an action for specific performance of such covenants,
     except for a defense that the Secured Obligations are not due and
     payable.

               3.3  Certain Sales of Collateral.  If Secured Party
                    ---------------------------


















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     shall determine to exercise its right to sell or otherwise dispose of
     any or all of the Securities Collateral and if, in the opinion of
     Secured Party or counsel for Secured Party, it is necessary or
     advisable to have such Securities Collateral, or any portion thereof,
     registered under the provisions of the Securities Act of 1933 (as
     amended from time to time and, together with any successor
     legislation, the "Securities Act"), Debtor covenants and agrees that
     Debtor will cause each of the Securities Issuers, as applicable, and
     its directors and officers, to execute and deliver, at Debtor's
     expense, all such instruments and documents, and to do or cause to be
     done all other acts and things as may be necessary or advisable, in
     the opinion of Secured Party or counsel for Secured Party, to register
     such Securities Collateral, or such portion thereof, under the
     provisions of the Securities Act and to cause the registration
     statement relating thereto to become effective and to remain effective
     for a period of one (1) year from the date of the first public
     offering of such Securities Collateral, or such portion thereof, and
     to make all amendments thereto and/or to the related prospectus which,
     in the opinion of Secured Party or counsel for Secured Party, are
     necessary or advisable, all in conformity with the requirements of the
     Securities Act and the rules and regulations of the Securities and
     Exchange Commission applicable thereto.  Debtor also covenants and
     agrees that Debtor will cause each of the Securities Issuers, as
     applicable, and its directors and officers, to comply with the
     provisions of the securities or "Blue Sky" laws of any jurisdiction
     which Secured Party shall designate.  Debtor recognizes that,
     notwithstanding the foregoing provisions of this Subsection, Secured
     Party may be unable to effect a public sale of all or a part of the
     Securities Collateral by reason of certain prohibitions contained in
     the Securities Act and other federal and/or State securities laws, but
     may be compelled to resort to private sale to a purchaser or
     purchasers from a restricted group of bidders who will be obliged to
     agree, among other things, to acquire such Securities Collateral for
     its or their own account, for investment and without a view to the
     distribution or resale thereof.  Debtor acknowledges and agrees that a
     private sale so made may be at a price and on other terms less
     favorable than if such Securities Collateral were sold at public sale,
     and agrees that Secured Party has no obligation to cause, or to delay
     the sale of any of such Securities Collateral for the period of time
     necessary to permit, any person to register such Securities Collateral
     for sale under such laws.  Debtor agrees that private sales made under
     the foregoing circumstances shall be deemed to have been made in a
     commercially reasonable manner.

               3.4 Expenses.  Debtor agrees to pay to Secured Party, each
                   --------
     Lender, each Noteholder and Issuing Bank upon its demand from time to
     time, the amount of all expenses, including reasonable attorneys' fees
     and expenses, paid or incurred by it (a) in exercising or enforcing or
     consulting with counsel


















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     concerning, any of its rights hereunder or under law, or (b) in
     defending any and all non-meritorious or previously waived demands,
     claims, counterclaims, cross-claims, causes of action, litigation and
     proceedings of every kind and nature asserted, commenced or instituted
     against it or any of its officers, directors, employees or agents, by
     Debtor, any Subsidiary of Debtor or any Other Obligor on account of,
     as a result of or relating to, any action taken or not taken by
     Secured Party, any Lender, any Noteholder or Issuing Bank in
     connection with the Collateral or enforcement or exercise by it of any
     of its rights or remedies under this Agreement or under law.  Debtor
     also agrees to pay to Secured Party, each Lender, each Noteholder and
     Issuing Bank upon its demand from time to time, interest on the
     outstanding amount of such expenses, from the date of demand for
     payment of such expenses until the same are paid in full, at the rate
     from time to time applicable to Base Rate Loans.


                        SECTION 4.  ADDITIONAL PROVISIONS


     4.1Further Assurances, Power of Attorney.  Debtor agrees promptly to
        -------------------------------------
     do, make, execute and deliver all such additional and further acts,
     things, deeds, assurances, instruments and documents as Secured Party
     may request in good faith to vest in and assure to Secured Party its
     rights hereunder or in any of the Collateral.  Debtor hereby appoints
     Secured Party and its designees as attorney-in-fact of Debtor,
     irrevocably and with power of substitution, with authority to execute
     and deliver from time to time, in the name and stead of Debtor, all
     documents which Debtor is required to, but has failed or refused to,
     execute and deliver to Secured Party pursuant to this Agreement, and
     with authority to take all of the actions from time to time on behalf
     of Debtor, and in the name and stead of Debtor, which Secured Party is
     authorized to take under this Agreement or which Secured Party in its
     discretion exercised in good faith deems necessary or advisable in
     order to cause Debtor to be in compliance with any of the terms of
     this Agreement or in order to carry out and enforce this Agreement. 
     Said attorney or designee shall not be liable for any acts of
     commission or omission nor for any error of judgment or mistake of
     fact or law which does not arise from its gross negligence or willful
     misconduct.  This power of attorney is coupled with an interest and is
     irrevocable so long as any of the Secured Obligations remain unpaid or
     unperformed or there exists any commitment by Lenders or Noteholders
     which could give rise to any Secured Obligations.

               4.2 Waiver of Trial by Jury.  Each of Debtor and Secured
                   -----------------------
     Party agrees that any action, suit or proceeding involving any claim,
     counterclaim or cross-claim arising out of or in any way relating,
     directly or indirectly, to this Agreement, or any liabilities, rights
     or interests of Debtor,

















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     Secured Party or any other person arising out of or in any way
     relating, directly or indirectly, to this Agreement, shall be tried by
     a court and not by a jury.  Debtor and Secured Party hereby waives any
     right to trial by jury in any such action, suit or proceeding, with
     the understanding and agreement that this waiver constitutes a waiver
     of trial by jury of all claims, counterclaims and cross-claims against
     all parties to such actions, suits or proceedings, including claims,
     counterclaims and cross-claims against parties who are not parties to
     this Agreement.  This waiver is knowingly, willingly and voluntarily
     made by Debtor and Secured Party, and Debtor and Secured Party
     acknowledges and agrees that this waiver of trial by jury is a
     material aspect of the agreements between Debtor and Secured Party and
     that no representations of fact or opinion have been made by any
     person to induce this waiver of trial by jury or to modify, limit or
     nullify its effect.

               4.3  Additional Waivers.  Except in the case of any notices
                    ------------------
     specifically required to be given to Debtor by Secured Party, any
     Lender, Issuing Bank or any Noteholder pursuant to this Agreement, any
     of the Lender Documents or any of the Noteholder Documents, Debtor
     hereby waives notice of each and every one of the following acts,
     events and/or conditions and agrees that, without necessity for any
     express reservation of rights against Debtor, neither the occurrence
     or existence of any such act, event or condition, nor Secured Party's,
     any Lender's, Issuing Bank's or any Noteholder's commission of or
     omission to do any such act, event or condition, in any number of
     instances, shall in any way release, discharge, impair or diminish any
     of the Secured Obligations, except as otherwise specifically agreed by
     Secured Party in writing:  (a) the amendment, modification, renewal,
     extension or refinancing of, or the granting by Secured Party, any
     Lender, Issuing Bank or any Noteholder of any indulgence of any nature
     with respect to, or the invalidity, voidability, unenforceability,
     compromise, settlement, release, waiver, discharge or impairment, in
     whole or in part, of, any of the Secured Obligations or any obligation
     of any Other Obligor with respect to any of the Secured Obligations;
     (b) any defense of Debtor or any Other Obligor to payment of any of
     the Secured Obligations; (c) the addition of any maker, guarantor,
     surety, endorser, indemnitor or other person primarily or secondarily
     liable for or obligated upon any of the Secured Obligations;
     (d) assumption of any of the Secured Obligations by any other person,
     whether by assignment, sale, merger, consolidation, sublease,
     conveyance or otherwise; (e) delivery to Secured Party, any Lender,
     Issuing Bank or any Noteholder or acceptance by Secured Party, any
     Lender, Issuing Bank or any Noteholder of any promissory note or other
     instrument or writing evidencing or otherwise relating to any of the
     Secured Obligations; (f) the institution of any suit, the obtaining of
     any judgment or the exercise of any other right or remedy against
     Debtor or any Other Obligor; (g) the sale, exchange, pledge, release,
     disposition,


















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     surrender, loss, destruction, damage to or impairment of, any
     Collateral; (h) the creation, perfection, continuation, amendment,
     modification, invalidity, voidability, unenforceability, compromise,
     settlement, subordination, release, waiver, discharge, impairment or
     loss of priority, in whole or in part, of, any security interest, lien
     other encumbrance directly or indirectly securing any of the
     Obligations; or (i) any other event, circumstance or condition which
     might otherwise constitute a legal or equitable discharge of a
     borrower.  Debtor also hereby waives, to the extent the same may be
     waived under applicable law:  (a) notice of acceptance by Secured
     Party of this Agreement; (b) all claims, causes of action and rights
     of Debtor against Secured Party on account of actions taken or not
     taken by Secured Party in the exercise of Secured Party's rights or
     remedies under this Agreement or under law, provided that the same did
     not arise from Secured Party's negligence or willful misconduct;
     (c) all claims and causes of action of Debtor against Secured Party
     for punitive, exemplary, indirect, special, consequential or other
     non-compensatory damages; (d) all rights of redemption of Debtor with
     respect to any of the Collateral; (e) in the event Secured Party seeks
     to repossess any or all of the Collateral by judicial proceedings, any
     bonds or demands for possession which otherwise may be required;
     (f) all rights of Debtor to have marshalled the Collateral or any
     other security for any of the Secured Obligations; (g) diligence in
     the enforcement or collection of all of the Obligations;
     (h) presentment, protest, notice of protest and notice of non-payment
     with respect to all of the Secured Obligations; and (i) any duty or
     obligation of Secured Party to disclose to Debtor any information
     concerning any other customer or client, or prospective customer or
     client, of Secured Party.  Debtor agrees that Secured Party may
     exercise any or all of its rights and/or remedies without resorting
     to, without regard to, and regardless of the adequacy of, any security
     or other sources of liability with respect to any of the Secured
     Obligations.  Neither any failure nor any delay on the part of Secured
     Party in exercising any right, power or remedy shall operate as a
     waiver thereof, nor shall a single or partial exercise thereof
     preclude any other or further exercise thereof or the exercise of any
     other right, power or remedy.

               4.4 Modifications, Notices.  No modification or waiver of
                   ----------------------
     any provision of this Agreement, and no consent by Secured Party to
     any failure of any of Debtor to comply with any provision of this
     Agreement, shall in any event be effective unless the same shall be in
     writing and signed by the person against whom enforcement thereof is
     sought, and then such waiver or consent shall be effective only in the
     specific instance and for the purpose for which given.  No notice to
     or demand upon Debtor in any circumstance shall entitle Debtor to any
     other or further notice or demand in the same, similar or other
     circumstances.  All notices, requests and demands to or upon the



















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     respective parties hereto to be effective shall be in writing and
     shall be deemed to have been duly given or made when delivered by
     hand, or, if earlier, three (3) calendar days after being deposited in
     the mail, postage prepaid, or when transmitted by telecopy
     transmission, provided that any such notice or communication to Debtor
     shall be hand-delivered or transmitted to Debtor at the Debtor Notice
     Address (or at such other address as Debtor may specify to Secured
     Party in writing from time to time), and any such notice or
     communication to Secured Party shall be hand-delivered or transmitted
     to Secured Party at the Secured Party Notice Address (or at such other
     address as Secured Party may specify to Debtor in writing from time to
     time).

               4.5 Survival, Merger and Counterparts.  All representations,
                   ---------------------------------
     warranties, covenants, conditions and agreements contained herein
     shall survive the execution and delivery hereof.  Debtor shall
     continue to observe, comply with and perform all warranties,
     covenants, conditions and agreements to be observed, complied with or
     performed by Debtor under this Agreement until all of the Lender
     Obligations have been paid in full and there exists no commitment by
     any of Lenders or Issuing Bank which could give rise to any Lender
     Obligations.  This Agreement contains the entire agreement of the
     parties with respect to the matters covered and the transactions
     contemplated hereby and thereby, and no agreement, statement or
     promise made by any party hereto, or by any employee, officer, agent
     or attorney of any party hereto, which is not contained herein or
     therein, shall be valid or binding.  This Agreement may be executed in
     any number of counterparts and by different parties on separate
     counterparts, each of which, when so executed and delivered, shall be
     an original, but all such counterparts shall together constitute one
     and the same agreement.

               4.6 Law, Jurisdiction, Process, Transfers and
                   -----------------------------------------
     Unenforceability.  The performance and construction of this Agreement
     ----------------
     shall be governed by the internal laws of the State of Maryland
     (exclusive of principles of conflicts of laws).  Debtor agrees that
     any suit, action or proceeding with respect to the Collateral or this
     Agreement may be brought in any state or federal court located in the
     State of Maryland.  Debtor consents to the in personam jurisdiction of
                                                -- --------
     such courts and Debtor irrevocably waives any objection to, and any
     right of immunity from, the jurisdiction of such courts or the
     execution of judgments resulting therefrom, on the grounds of venue or
     the convenience of the forum.  In addition, any such suit, action or
     proceeding instituted by Secured Party may be brought in such other
     courts in which jurisdiction and venue may be appropriate.  Debtor
     agrees that service of process in any such suit, action or proceeding
     may be effected by mailing a copy thereof by registered or certified
     mail (or any substantially similar form of mail), postage prepaid, to
     Debtor at the Debtor Notice Address (or at such other address as
     Debtor may specify to Secured Party














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     in writing from time to time).  This Agreement shall be binding upon
     and inure to the benefit of the parties hereto and their respective
     successors and assigns, and each reference in this Agreement to any of
     the parties hereto shall be deemed to include the successors and
     assigns of such party, including, in the case of Debtor, the debtor,
     the debtor in possession and trustee in any case under any chapter of
     the United States Bankruptcy Code in which Debtor is debtor.  Debtor
     may not assign this Agreement or any of its rights hereunder without
     Secured Party's prior written consent.  Subject to applicable law and
     agreements, any of Lenders, Issuing Bank or Noteholders may at any
     time, in its discretion, assign, transfer or pledge to any person, or
     grant to any person a security interest in, this Agreement or any of
     its rights hereunder.  Subject to applicable law and agreements, any
     of Lenders, Issuing Bank or Noteholders may sell, in such amounts,
     upon such terms and to such persons as it may determine,
     participations in its beneficial interests under this Agreement.  If
     any term, provision or condition, or any part thereof, of this
     Agreement shall for any reason be found or held invalid or
     unenforceable by any court or governmental agency, such invalidity or
     unenforceability shall not affect the remainder of such term,
     provision or condition, nor any other term, provision or condition,
     and this Agreement shall survive and be construed as if such invalid
     or unenforceable term, provision or condition had not been contained
     herein or therein; provided, however, that if any rate of interest
     provided under this Agreement does or shall exceed the maximum
     interest rate which Debtor is permitted by law to contract or agree to
     pay, then such rate of interest shall immediately be deemed to be
     reduced to such maximum rate and all previous payments of interest in
     excess of the maximum rate shall be deemed to have been payments in
     reduction of principal and not of interest.

               IN WITNESS WHEREOF, Debtor and Secured Party have duly
     executed this Agreement under seal as of the day and year first
     written above.


     ATTEST/WITNESS:                    FIRST FIDELITY BANK, NATIONAL
                                           ASSOCIATION



     _________________________
     By:__________________________(SEAL)
                                           Michael W. Coiley
                                           Vice President


                                        AAI CORPORATION




















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<PAGE>

<PAGE>




                                        By:__________________________(SEAL)
     -------------------------
                                           Paul J. Michaud
                                           Vice President
































































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<PAGE>




                               SECURITIES EXHIBIT
                               -------------------



     Carshell Securities:

     1,000 shares of the common stock of Carshell, evidenced by Certificate
     No. 1 issued on September 10, 1993


     Engineering Securities:

     100 shares of the common stock of Engineering, evidenced by
     Certificate No. 2 issued on August 26, 1994


     International Securities:

          30 shares of the common stock of International, evidenced by
          Certificate No. 1 issued on December 30, 1971


     Medical Securities:

          5,000 shares of the common stock of Medical, evidenced by
          Certificate No. 1 issued on March 9, 1990


     Microflite Securities:

          1,000 shares of the common stock of Microflite, evidenced by
          Certificate No. 1 issued on June 19, 1991


     Seti Securities:

          25,000 shares of the common stock of Seti, evidenced by
          Certificate No. 4 issued on August 26, 1994





























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<PAGE>

<PAGE>




     Systems Securities:

          100 shares of the common stock of Systems, evidenced by
          Certificate No. 1 issued on April 25, 1989


     Technologies Securities:

          1,000 shares of the common stock of Technologies, evidenced by
          Certificate No. 2 issued on August 26, 1994


























































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<PAGE>

<PAGE>




     STATE OF MARYLAND, CITY OF BALTIMORE, SS:


               I HEREBY CERTIFY that on this ____________ day of
     _____________________, 1994, before me, the undersigned, a Notary
     Public of said State, personally appeared Paul J. Michaud, who
     acknowledged himself to be the Vice President of AAI Corporation, and
     that he, as such, being authorized so to do, executed the foregoing
     instrument for the purposes therein contained.

               WITNESS my hand and Notarial Seal.



                                             ______________________________
                                             Notary Public

     My Commission expires:

           10/1/97
     --------------------


     STATE OF MARYLAND, CITY OF BALTIMORE, SS:


               I HEREBY CERTIFY that on this ___________ day of
     ______________________, 1994, before me, the undersigned, a Notary
     Public of said State, personally appeared Michael W. Coiley, who
     acknowledged himself to be the Vice President of First Fidelity Bank,
     National Association, and that he, as such, being authorized so to do,
     executed the foregoing instrument for the purposes therein contained.

               WITNESS my hand and Notarial Seal.


                                             ______________________________
                                             Notary Public

     My Commission expires:

           10/1/97
     --------------------






















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<PAGE>




                          PLEDGE AND SECURITY AGREEMENT


     THIS AGREEMENT is made as of the ______ day of __________________,
     1994, by and between FIRST FIDELITY BANK, NATIONAL ASSOCIATION, as
     Agent (in such capacity, "Secured Party") for the Lenders, the Issuing
     Bank and the Noteholders (as those terms are hereinafter defined), and
     UNITED INDUSTRIAL CORPORATION, a Delaware corporation ("Debtor").


              SECTION 1.  CONSTRUCTION OF AGREEMENT AND DEFINITIONS


     Unless the context otherwise requires, all of the terms used herein
     without definition which are defined by the Maryland Uniform
     Commercial Code shall have the meanings assigned to them by the
     Maryland Uniform Commercial Code except to the extent varied by this
     Agreement.  Unless the context otherwise requires, all capitalized
     terms hereinbefore or hereinafter used in this Agreement without
     definition shall have the meanings assigned to such terms in the
     Credit Agreement.  The phrases "satisfactory to Secured Party,"
     "acceptable to Secured Party" and similar phrases shall mean
     satisfactory or acceptable to Secured Party, in Secured Party's
     discretion exercised in good faith.  The use of the singular herein
     shall also refer to the plural and vice versa, and the use herein of
     any gender, including the neuter, shall also refer to each of the
     other genders, including the neuter.  The captions and headings
     contained in this Agreement are for convenience of reference only and
     shall not affect the meaning, or the construction or interpretation,
     of this Agreement.  In addition to terms defined elsewhere in this
     Agreement, the following terms shall have the following meanings when
     used herein:

               "BORROWER" shall mean AAI Corporation, a Maryland
     corporation formerly known as "United/AAI Corporation."

               "BORROWER SECURITIES" shall mean the shares of capital stock
     of Borrower identified on the Securities Exhibit attached to this
     Agreement and incorporated by reference into this Agreement, and all
     other shares of capital stock and other securities of Borrower, now
     owned or hereafter acquired by Debtor.

               "COLLATERAL" shall mean:  (a) the Securities Collateral; and
     (b) all of Debtor's present and future books and records in any form
     relating to the Securities Collateral, in or on any media, including
     data processing materials in any form (including software, tapes,
     disks and the like), whether in the possession of Debtor or any other
     person.

               "CREDIT AGREEMENT" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Credit Agreement of even date herewith
     among Borrower, Secured Party, Lenders and Issuing Bank.
<PAGE>

<PAGE>




               "DEBTOR DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, this Agreement, the UIC Noteholder Guaranty and any
     additional Noteholder Documents executed or assumed by Debtor, the
     Lender Guaranty, the UIC Subordination Agreement and any additional
     Credit Documents executed or assumed by Debtor.

               "DEBTOR OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, increased,
     refinanced, consolidated or replaced from time to time, all present
     and future obligations, indebtedness and liabilities of Debtor to each
     of Lenders, Issuing Bank and Noteholders of every kind and nature
     evidenced by or arising under or in connection with the Debtor
     Documents (including, without limitation, all principal amounts,
     interest charges, fees, commissions and all other charges and sums, as
     well as all costs and expenses, including reasonable attorneys' fees
     and expenses, payable or reimbursable by Debtor under or pursuant to
     the Debtor Documents), whether direct or indirect, contingent or
     noncontingent, matured or unmatured, accrued or not accrued,
     liquidated or unliquidated, whether arising in contract, tort or
     otherwise, whether the liability of Debtor with respect thereto is
     joint or several or both, and whether or not any instrument or
     agreement relating thereto specifically refers to this Agreement,
     including, without limitation, all claims of Lenders, Issuing Bank and
     Noteholders against Debtor arising or re-arising on account of or as a
     result of any payment made by Debtor or any other person with respect
     to any obligations included in this definition which is rescinded or
     recovered from or restored or returned by any of Lenders, Issuing Bank
     or Noteholders under authority of any law, rule, regulation, order of
     court or governmental agency, or in connection with any compromise or
     settlement relating thereto or relating to any pending or threatened
     action, suit or proceeding relating thereto, whether arising out of
     any proceedings under the United States Bankruptcy Code or otherwise.

               "DEBTOR NOTICE ADDRESS" shall mean 18 East 48th Street, New
     York, New York 10017.

               "EVENT OF DEFAULT" shall mean an "Event of Default," as
     defined in the Credit Agreement, or an "Event of Default," as defined
     in the Note Purchase Agreement.

               "GOOD FAITH" shall mean, with respect to a determination,
     request or other action to be made or taken by Secured Party "in good
     faith," that Secured Party shall make or take such determination,
     request or other action honestly and not maliciously.

               "INTERCREDITOR AGREEMENT" shall mean, as the same may





















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<PAGE>




     be amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Intercreditor Agreement of even date
     herewith among Secured Party, Lenders, Issuing Bank and Noteholders.

               "ISSUING BANK" shall mean the person from time to time party
     to the Credit Agreement as "Issuing Bank."

               "LENDER DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, the Credit Agreement, the Revolving Credit Notes, the
     Borrower Security Agreement, the Borrower Pledge Agreement, the Deed
     of Trust, the Lender Guaranty, the Guarantor Security Agreement, the
     UIC Subordination Agreement, the UIC-DEL Subordination Agreement, the
     L/C Agreements, this Agreement, and any and all other agreements,
     contracts, promissory notes and other instruments, security
     agreements, assignments, pledge agreements, indemnification
     agreements, mortgages, deeds of trust, leases, guaranties and other
     documents now or hereafter existing and evidencing, securing (directly
     or indirectly), guaranteeing (or in effect guaranteeing) or
     indemnifying (or in effect indemnifying) any of Lenders or Issuing
     Bank with respect to, any of the aforementioned documents or any
     obligations of any person to any of Lenders or Issuing Bank
     thereunder.

               "LENDER GUARANTY" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Guaranty of even date herewith executed and
     delivered by Debtor in favor of Secured Party, Lenders and Issuing
     Bank.

               "LENDER OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, refinanced,
     consolidated or replaced from time to time, all present and future
     Revolving Credit Loans, L/C Reimbursement Obligations and other
     obligations, indebtedness and liabilities of Borrower to each of
     Lenders and Issuing Bank arising under, evidenced by or in connection
     with the Credit Agreement or the other Lender Documents, including,
     without limitation, all principal amounts, including future advances,
     indemnification obligations, interest charges, fees, premiums,
     commissions and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Borrower under or in connection with the Credit
     Agreement or the other Lender Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing, and including, without limitation, all claims
     against Borrower arising or re-arising on account of or as a result of
     any payment made by



















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<PAGE>




     Borrower or any other person with respect to any obligations included
     in this definition which is rescinded or recovered from any of Lenders
     or Issuing Bank or restored or returned by any of Lenders or Issuing
     Bank under authority of any law, rule, regulation, order of court or
     Governmental Authority, or in connection with any compromise or
     settlement relating thereto or relating to any pending or threatened
     action, suit or proceeding relating thereto, whether arising out of
     any proceedings under the United States Bankruptcy Code or otherwise. 


               "LENDERS" shall mean the persons from time to time parties
     to the Credit Agreement as "Lenders."

               "NOTE PURCHASE AGREEMENT" shall mean, as the same has been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Note Purchase
     Agreement dated July 15, 1992, among Borrower and Noteholders.

               "NOTEHOLDER DOCUMENTS" shall mean, as the same have been or
     may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, the Note Purchase
     Agreement, the Noteholder Notes, the UIC Noteholder Guaranty and any
     and all other agreements, contracts, promissory notes and other
     instruments, security agreements, assignments, pledge agreements,
     indemnification agreements, mortgages, deeds of trust, leases,
     guaranties and other documents now or hereafter existing and
     evidencing, securing, directly or indirectly, guaranteeing (or in
     effect guaranteeing) or indemnifying (or in effect indemnifying)
     Noteholders with respect to, any of the aforementioned documents or
     any obligations of any person to Noteholders thereunder.

               "NOTEHOLDER NOTES" shall mean, as the same have been or may
     hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain 8.65% Senior
     Note Due July 31, 1999, dated August 11, 1992, issued by Borrower to
     TRAL & CO, nominee of The Travelers Insurance Company, pursuant to the
     Note Purchase Agreement in the original principal amount of
     $9,000,000.00, that certain 8.65% Senior Note Due July 31, 1999, dated
     August 11, 1992, issued by Borrower to TRAL & CO, nominee of The
     Travelers Indemnity Company of Rhode Island, pursuant to the Note
     Purchase Agreement in the original principal amount of $3,000,000.00
     and assigned by The Travelers Indemnity Company of Rhode Island to The
     Travelers Insurance Company, that certain 8.65% Senior Note Due
     July 31, 1999, dated August 11, 1992, issued by Borrower to Principal
     Mutual Life Insurance Company pursuant to the Note Purchase Agreement
     in the original principal amount of $10,000,000.00, and that certain
     8.65% Senior Note Due July 31, 1999, dated August 11, 1992, issued by
     Borrower to Principal Mutual Life Insurance Company pursuant to the
     Note Purchase Agreement in the original principal



















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<PAGE>




     amount of $3,000,000.00.

               "NOTEHOLDER OBLIGATIONS" shall mean, as the same have been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented, refinanced, consolidated or replaced from time to time,
     all present and future obligations, indebtedness and liabilities of
     Borrower to each of Noteholders arising under, evidenced by or in
     connection with the Noteholder Documents, including, without
     limitation, principal amounts (but not including any additional loans
     or advances by Noteholders to Debtor), interest charges, fees,
     premiums and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Borrower to each of Noteholders under or in
     connection with the Noteholder Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing and including, without limitation, all claims
     against Borrower arising or re-arising on account of or as a result of
     any payment made by Borrower or any other person with respect to any
     obligations included in this definition which is rescinded or
     recovered from any of Noteholders or restored or returned by any of
     Noteholders under authority of any law, rule, regulation, order of
     court or Governmental Authority, or in connection with any compromise
     or settlement relating thereto or relating to any pending or
     threatened action, suit or proceeding relating thereto, whether
     arising out of any proceedings under the United States Bankruptcy Code
     or otherwise.  

               "NOTEHOLDERS" shall mean, collectively, Principal Mutual
     Life Insurance Company, an Iowa corporation, and The Travelers
     Insurance Company, a Connecticut corporation.

               "PERSON" shall mean any individual, corporation, limited
     liability company, partnership, joint venture, association, trust,
     business trust, Governmental Authority (or subdivision, agency or
     department thereof) or other entity of any kind.

               "SECURED OBLIGATIONS" shall mean, collectively, the Lender
     Obligations, the Noteholder Obligations and the Debtor Obligations.

               "SECURED PARTY NOTICE ADDRESS" shall mean 123 South Broad
     Street, Philadelphia, Pennsylvania 19109.

               "SECURITIES" shall mean the Borrower Securities and the
     Symtron Securities.

               "SECURITIES CERTIFICATES" shall mean the certificates
     evidencing the Securities identified on the Securities Exhibit



















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<PAGE>




     attached to this Agreement and incorporated by reference into this
     Agreement.

               "SECURITIES COLLATERAL" shall mean:  (a) all present and
     future rights, titles and interests of Debtor in, to and under the
     Securities; (b) all present and future rights, titles, interests,
     powers, authorities, options, warrants, privileges and benefits of,
     accruing to or in any way relating to the Securities; (c) all present
     and future rights, titles and interests of Debtor in, to and under the
     Securities Documents and any oral agreements which, if written, would
     constitute Securities Documents, and all present and future rights,
     titles, interests, powers, authorities, options, warrants, privileges
     and benefits of Debtor arising under or in connection with the
     Securities Documents or any such oral agreements; (d) all present and
     future rights and claims of Debtor to the payment or receipt of money
     and other property of every kind for any reason arising under, on
     account of, in respect of, in evidence of, as an addition to, in
     substitution for, in replacement of, in exchange for, or in any other
     manner relating to, the Securities, the Securities Documents or any
     such oral agreements, whether in connection with any merger,
     consolidation, reorganization, recapitalization, reclassification,
     stock split, liquidation, increase or reduction of capital or other
     similar occurrence in respect of any of the Securities Issuers, or
     otherwise; (e) all present and future rights, titles and interests of
     Debtor in and to all present and future payments, receipts,
     collections, profits, revenues, dividends (including, without
     limitation, stock dividends, cash dividends and liquidating
     dividends), distributions, surplus, income, settlements, exchanges,
     benefits and other proceeds and avails in every form of or in any way
     relating to, the Securities, the Securities Documents or any such oral
     agreements, including, without limitation, all present and future
     rights and claims of Debtor to the payment or receipt of money and
     other property of every kind for any reason arising on account of or
     in any way relating to, and all present and future rights, titles and
     interests of Debtor in and to all proceeds in every form of, any
     voluntary or involuntary purchase, sale, transfer, conveyance,
     assignment, redemption, encumbrance, financing, re-financing,
     recapitalization, reorganization, exchange, liquidation, condemnation,
     taking, theft or disposition of any nature of, or any damage or
     casualty to, or any loss with respect to, the Securities, the
     Securities Documents, any such oral agreements or any of the
     Securities Issuers; and (f) all present and future proceeds of all of
     the foregoing, including, without limitation, cash proceeds, non-cash
     proceeds and proceeds acquired with cash proceeds, whether any such
     proceeds constitute consumer goods, farm products, equipment,
     inventory, documents of title, chattel paper, accounts, instruments or
     general intangibles, and including, without limitation, all proceeds
     of insurance policies insuring any of the foregoing or any risks
     relating to any of the foregoing.



















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<PAGE>




               "SECURITIES DOCUMENTS" shall mean, as the same may be
     waived, amended, modified, extended, renewed, supplemented or replaced
     from time to time, the Securities Certificates and all other present
     and future certificates, agreements, contracts, instruments and other
     documents and writings evidencing or in any way relating to the
     Securities or any rights, titles, interests, powers, authorities,
     options, warrants, privileges or benefits of, accruing to or in any
     way relating to the Securities, including, without limitation, any
     such documents and writings in any way relating to the purchase, sale,
     transfer, conveyance, assignment, redemption, encumbrance, financing,
     re-financing, exchange, liquidation or disposition of any nature of,
     the Securities or any rights, titles, interests, powers, authorities,
     options, warrants, privileges or benefits of, accruing to or in any
     way relating to the Securities.

               "SECURITIES ISSUERS" shall mean Borrower and Symtron.

               "SYMTRON" shall mean Symtron Systems, Inc., a New Jersey
     corporation.

               "SYMTRON SECURITIES" shall mean the shares of capital stock
     of Symtron identified on the Securities Exhibit attached to this
     Agreement and incorporated by reference into this Agreement, and all
     other shares of capital stock and other securities of Symtron, now
     owned or hereafter acquired by Debtor.

               "UIC NOTEHOLDER GUARANTY" shall mean, as the same has been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Guaranty
     Agreement dated July 15, 1992, executed and delivered by Debtor in
     favor of Noteholders.


                  SECTION 2.  SECURITY INTEREST AND COLLATERAL


     2.1Grant of Security Interest.  As security for the Secured
        --------------------------
     Obligations, Debtor hereby grants to Secured Party, for the ratable
     benefit of Lenders, Issuing Bank and Noteholders according to the
     provisions of this Agreement and the Intercreditor Agreement, a lien
     and continuing security interest in, and pledges and assigns to
     Secured Party, for the ratable benefit of Lenders, Issuing Bank and
     Noteholders according to the provisions of this Agreement and the
     Intercreditor Agreement, the Collateral.  Even if any of the Secured
     Obligations shall at any time or from time to time be paid in full,
     Secured Party's security interest shall continuously exist until all
     of the Lender Obligations and all of the Debtor Obligations to each
     Lender and Issuing Bank have been paid in full and there exists no
     commitment by any of Lenders or Issuing Bank which could give rise to
     any Lender Obligations.

















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               2.2 Additional Documents.  Debtor agrees to execute and
                   --------------------
     deliver to Secured Party, or cause to be executed and delivered to
     Secured Party, from time to time promptly after request by Secured
     Party and in form and content satisfactory to Secured Party, such
     security agreements, financing statements, amendments of financing
     statements, assignments of financing statements, security interest
     filing statements, mortgages, deeds of trust, assignments, notices,
     consents and other documents as Secured Party may request in good
     faith in order to confirm, supplement, preserve, protect or perfect,
     or to maintain the perfection of, Secured Party's security interest in
     the Collateral and Secured Party's rights under this Agreement.

               2.3  Representations and Warranties Concerning Collateral. 
                    ----------------------------------------------------
     Debtor represents and warrants that:  (a) no assignments of any of the
     Collateral have previously been made, and no financing statement,
     mortgage, deed of trust, assignment, notice of lien or other security
     document publicizing a security interest in or lien upon any of the
     Collateral is or will be on file in any recording or filing office,
     and the Collateral is and shall remain free and clear of all liens,
     security interests, assignments and encumbrances of every kind, except
     as created hereby; and (b) Debtor is the legal and beneficial owner of
     all of the Collateral.

               2.4  Representations and Warranties Concerning Securities
                    ----------------------------------------------------
     Issuers and Securities Documents.  Debtor represents and warrants
     --------------------------------
     that:  (a) the execution, delivery and performance of this Agreement
     will not violate any term, provision or requirement of the articles of
     incorporation, corporate charter or bylaws of any of the Securities
     Issuers or any material instrument, contract, agreement, indenture,
     mortgage, deed of trust or other document or obligation to which any
     of the Securities Issuers is a party or by which any of the Securities
     Issuers, or any of their property, is bound; (b) there are presently
     no Securities Documents except for the Securities Certificates;
     (c) the Securities evidenced by the Securities Certificates have been
     duly issued to Debtor and are fully paid and non-assessable; (d) none
     of the Securities constitute "margin stock," as defined in Regulation
     U of the Board of Governors of the Federal Reserve System; and
     (e) there are outstanding no options, warrants, convertible debt
     instruments or other similar instruments issued by any of the
     Securities Issuers conferring on any person any contingent or
     noncontingent rights to acquire any capital stock of any of the
     Securities Issuers.

               2.5  Additional Warranties and Agreements Concerning
                    -----------------------------------------------
     Collateral.  Debtor warrants and agrees that:  (a) Debtor will
     ----------
     promptly deliver to Secured Party, with such indorsements, powers
     and/or assignments as Secured Party may from time to time request in
     good faith, all Securities Documents now or hereafter in Debtor's
     possession or control; (b) except for cash dividends













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     received by Debtor on account of the Securities at a time when no
     Event of Default shall be continuing (not including cash dividends in
     connection with the dissolution, liquidation or sale of any of the
     Securities Issuers  or any property of any of the Securities Issuers),
     Secured Party shall have the right to receive, and Debtor shall
     promptly deliver, or cause to be delivered promptly, to Secured Party
     and, until so delivered, Debtor shall hold as Secured Party's agent
     and bailee, all money and other property in any form and for any
     reason paid, payable, distributed or distributable to Debtor, or
     received or receivable by Debtor, on account of or in respect of, or
     constituting, Collateral, with such indorsements and/or assignments as
     Secured Party may from time to time request; (c) all Collateral
     delivered to Secured Party or coming into Secured Party's possession
     or control from time to time may be held by Secured Party as security
     for the Secured Obligations; (d) Secured Party shall have the right,
     in its discretion, at any time and from time to time (i) to sign
     Debtor's name on any drafts or orders against, or demands, notices or
     other documents directed to, persons obligated or liable to Debtor on
     account of or in respect of any of the Collateral, (ii) to indorse
     Debtor's name on any instruments, checks, drafts, orders or other
     items of payment constituting Collateral that may come into Secured
     Party's possession or control from time to time, and/or (iii) to
     cause, or to require Debtor to cause, any of the Collateral to be
     registered in the name of Secured Party or its nominees; (e) no check,
     draft, money order or other item of payment received by Secured Party
     or applied on account of any of the Secured Obligations shall
     constitute a final payment to Secured Party unless and until the item
     of payment shall be honored and finally paid to Secured Party in
     immediately available funds; (f) except as otherwise specifically
     permitted by this Agreement, Debtor will not, directly or indirectly,
     without Secured Party's prior written consent, sell, assign, transfer,
     convey or otherwise dispose of, or suffer or permit to occur any sale,
     assignment, transfer, conveyance or disposition of, any of the
     Collateral, or any interest therein; and (g) except as otherwise
     specifically permitted by this Agreement, Debtor will not, without
     Secured Party's prior written consent, exercise or waive, or permit
     the waiver or loss of, any rights of Debtor with respect to any of the
     Collateral.






























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<PAGE>




                               SECTION 3.  DEFAULT


     3.1Remedies.  Upon and at any time after the occurrence and during the
        --------
     continuance of any Event of Default, Secured Party may, without notice
     or demand, exercise in any jurisdiction in which enforcement hereof is
     sought, the following rights and remedies, in addition to the other
     rights and remedies available to Secured Party, Lenders, Issuing Bank
     and Noteholders under the Lender Documents and the Noteholder
     Documents, the rights and remedies of a secured party under the
     Uniform Commercial Code and all other rights and remedies available to
     Secured Party under law, all such rights and remedies being cumulative
     and enforceable alternatively, successively or concurrently: 
     (a) notify, and/or require Debtor to notify, any or all of the
     Securities Issuers and any or all other persons obligated or liable on
     or with respect to any of the Securities Collateral to deliver to
     Secured Party promptly all money and other property in any form and
     for any reason payable or distributable to Debtor, or receivable by
     Debtor, on account of or in respect of, or constituting, Securities
     Collateral; (b) in the place and stead of Debtor as though Secured
     Party were the absolute owner thereof, exercise any and all voting
     rights pertaining to the Securities Collateral and exercise any and
     all rights of conversion, exchange or subscription, and all other
     privileges, options and rights pertaining to the Securities
     Collateral, whether in connection with any merger, consolidation,
     insolvency, reorganization, recapitalization, dissolution, liquidation
     or other similar occurrence in respect of any of the Securities
     Issuers or otherwise, and, in connection therewith, to deposit and
     deliver any or all of the Securities Collateral to or with any
     committee, depository, transfer agent, registrar or other person upon
     such terms and conditions as Secured Party may determine in its
     discretion; (c) take exclusive possession of any or all of the
     Collateral from time to time and, so far as Debtor may give authority
     therefor, enter upon any premises on which any of the Collateral may
     be situated and remove the same therefrom, Debtor hereby waiving any
     and all rights to prior notice and to judicial hearing with respect to
     repossession of Collateral, and/or require Debtor, at Debtor's
     expense, to assemble and deliver any or all of the Collateral to such
     place or places as Secured Party may reasonably request; and
     (d) enforce the liens and security interests granted to Secured Party
     hereunder by collecting or liquidating all or any part of the
     Collateral or selling, assigning, re-assigning or otherwise disposing
     of all or any part of the Collateral or any interest therein, in one
     or more parcels, at the same or different times, at public or private
     sale or disposition, or otherwise.

               3.2  Collateral Dispositions.  Debtor agrees that commercial
                    -----------------------
     reasonableness and good faith require Secured Party to give Debtor no
     more than ten (10) days prior written notice of

















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     the time and place of any public disposition of Collateral or of the
     time after which any private disposition or any other intended
     disposition is to be made.  All sales or other dispositions of
     Collateral may be made for cash, upon credit or for future delivery. 
     Debtor acknowledges and agrees that Secured Party may, in its
     discretion, elect to dispose of the Securities during the continuance
     of an Event of Default by causing any of the Securities Issuers to
     dissolve, liquidate and make liquidating dividends or distributions,
     and that such means of disposing of the Securities is commercially
     reasonable.  In no event shall Debtor be credited with any part of the
     proceeds of liquidation, sale or other disposition of any Collateral
     until final payment thereon has been received by Secured Party in
     immediately available funds, and Secured Party shall have no
     obligation to delay any liquidation, sale or other disposition because
     the same may result in the imposition of any forfeiture, premium or
     penalty.  In connection with any enforcement by Secured Party of the
     liens and security interests granted to Secured Party pursuant to this
     Agreement, Secured Party may demand, compromise, collect, enforce and
     sue for all money and other property in any form and for any reason
     payable or distributable to Debtor, or receivable by Debtor, on
     account of or in respect of, or constituting, Collateral, and
     otherwise exercise all rights of Debtor with respect to the
     Collateral, and all Collateral or proceeds of Collateral delivered to
     Secured Party or coming into Secured Party's possession or control
     from time to time may be applied by Secured Party from time to time,
     in whole or in part and in such order as Secured Party may determine
     in its discretion, to any of the Secured Obligations.  Debtor
     covenants and agrees, at Debtor's expense, to execute and deliver or
     cause to be executed and delivered, and to do or cause to be done, all
     such acts, things, instruments and documents as may, in the opinion of
     Secured Party or counsel to Secured Party, be necessary or advisable
     to make all sales and dispositions of Collateral valid, binding and
     enforceable and in compliance with all applicable laws, rules and
     regulations and all judgments, orders, awards, decrees, writs and
     injunctions of all courts, arbitrators or governmental authorities
     having jurisdiction over any such sales or dispositions.  Debtor
     acknowledges and agrees that a breach of any of the covenants
     contained in this Subsection or in Subsection 3.3 will cause
     irreparable injury to Secured Party and that Secured Party has no
     adequate remedy at law in respect of any such breach.  Debtor
     therefore acknowledges and agrees that each and every covenant
     contained in this Subsection and in Subsection 3.3 shall be
     specifically enforceable against Debtor, and Debtor hereby waives to
     the extent permitted by applicable law, and agrees not to assert, any
     defenses against an action for specific performance of such covenants,
     except for a defense that the Secured Obligations are not due and
     payable.

               3.3  Certain Sales of Collateral.  If Secured Party
                    ---------------------------


















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     shall determine to exercise its right to sell or otherwise dispose of
     any or all of the Securities Collateral and if, in the opinion of
     Secured Party or counsel for Secured Party, it is necessary or
     advisable to have such Securities Collateral, or any portion thereof,
     registered under the provisions of the Securities Act of 1933 (as
     amended from time to time and, together with any successor
     legislation, the "Securities Act"), Debtor covenants and agrees that
     Debtor will cause each of the Securities Issuers, as applicable, and
     its directors and officers, to execute and deliver, at Debtor's
     expense, all such instruments and documents, and to do or cause to be
     done all other acts and things as may be necessary or advisable, in
     the opinion of Secured Party or counsel for Secured Party, to register
     such Securities Collateral, or such portion thereof, under the
     provisions of the Securities Act and to cause the registration
     statement relating thereto to become effective and to remain effective
     for a period of one (1) year from the date of the first public
     offering of such Securities Collateral, or such portion thereof, and
     to make all amendments thereto and/or to the related prospectus which,
     in the opinion of Secured Party or counsel for Secured Party, are
     necessary or advisable, all in conformity with the requirements of the
     Securities Act and the rules and regulations of the Securities and
     Exchange Commission applicable thereto.  Debtor also covenants and
     agrees that Debtor will cause each of the Securities Issuers, as
     applicable, and its directors and officers, to comply with the
     provisions of the securities or "Blue Sky" laws of any jurisdiction
     which Secured Party shall designate.  Debtor recognizes that,
     notwithstanding the foregoing provisions of this Subsection, Secured
     Party may be unable to effect a public sale of all or a part of the
     Securities Collateral by reason of certain prohibitions contained in
     the Securities Act and other federal and/or State securities laws, but
     may be compelled to resort to private sale to a purchaser or
     purchasers from a restricted group of bidders who will be obliged to
     agree, among other things, to acquire such Securities Collateral for
     its or their own account, for investment and without a view to the
     distribution or resale thereof.  Debtor acknowledges and agrees that a
     private sale so made may be at a price and on other terms less
     favorable than if such Securities Collateral were sold at public sale,
     and agrees that Secured Party has no obligation to cause, or to delay
     the sale of any of such Securities Collateral for the period of time
     necessary to permit, any person to register such Securities Collateral
     for sale under such laws.  Debtor agrees that private sales made under
     the foregoing circumstances shall be deemed to have been made in a
     commercially reasonable manner.

               3.4 Expenses.  Debtor agrees to pay to Secured Party, each
                   --------
     Lender, each Noteholder and Issuing Bank upon its demand from time to
     time, the amount of all expenses, including reasonable attorneys' fees
     and expenses, paid or incurred by it (a) in exercising or enforcing or
     consulting with counsel


















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     concerning, any of its rights hereunder or under law, or (b) in
     defending any and all non-meritorious or previously waived demands,
     claims, counterclaims, cross-claims, causes of action, litigation and
     proceedings of every kind and nature asserted, commenced or instituted
     against it or any of its officers, directors, employees or agents, by
     Debtor, any Subsidiary of Debtor or any Other Obligor on account of,
     as a result of or relating to, any action taken or not taken by
     Secured Party, any Lender, any Noteholder or Issuing Bank in
     connection with the Collateral or enforcement or exercise by it of any
     of its rights or remedies under this Agreement or under law.  Debtor
     also agrees to pay to Secured Party, each Lender, each Noteholder and
     Issuing Bank upon its demand from time to time, interest on the
     outstanding amount of such expenses, from the date of demand for
     payment of such expenses until the same are paid in full, at the rate
     from time to time applicable to Base Rate Loans.


                        SECTION 4.  ADDITIONAL PROVISIONS


     4.1Further Assurances, Power of Attorney.  Debtor agrees promptly to
        -------------------------------------
     do, make, execute and deliver all such additional and further acts,
     things, deeds, assurances, instruments and documents as Secured Party
     may request in good faith to vest in and assure to Secured Party its
     rights hereunder or in any of the Collateral.  Debtor hereby appoints
     Secured Party and its designees as attorney-in-fact of Debtor,
     irrevocably and with power of substitution, with authority to execute
     and deliver from time to time, in the name and stead of Debtor, all
     documents which Debtor is required to, but has failed or refused to,
     execute and deliver to Secured Party pursuant to this Agreement, and
     with authority to take all of the actions from time to time on behalf
     of Debtor, and in the name and stead of Debtor, which Secured Party is
     authorized to take under this Agreement or which Secured Party in its
     discretion exercised in good faith deems necessary or advisable in
     order to cause Debtor to be in compliance with any of the terms of
     this Agreement or in order to carry out and enforce this Agreement. 
     Said attorney or designee shall not be liable for any acts of
     commission or omission nor for any error of judgment or mistake of
     fact or law which does not arise from its gross negligence or willful
     misconduct.  This power of attorney is coupled with an interest and is
     irrevocable so long as any of the Secured Obligations remain unpaid or
     unperformed or there exists any commitment by Lenders or Noteholders
     which could give rise to any Secured Obligations.

               4.2 Waiver of Trial by Jury.  Each of Debtor and Secured
                   -----------------------
     Party agrees that any action, suit or proceeding involving any claim,
     counterclaim or cross-claim arising out of or in any way relating,
     directly or indirectly, to this Agreement, or any liabilities, rights
     or interests of Debtor,

















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     Secured Party or any other person arising out of or in any way
     relating, directly or indirectly, to this Agreement, shall be tried by
     a court and not by a jury.  Debtor and Secured Party hereby waives any
     right to trial by jury in any such action, suit or proceeding, with
     the understanding and agreement that this waiver constitutes a waiver
     of trial by jury of all claims, counterclaims and cross-claims against
     all parties to such actions, suits or proceedings, including claims,
     counterclaims and cross-claims against parties who are not parties to
     this Agreement.  This waiver is knowingly, willingly and voluntarily
     made by Debtor and Secured Party, and Debtor and Secured Party
     acknowledges and agrees that this waiver of trial by jury is a
     material aspect of the agreements between Debtor and Secured Party and
     that no representations of fact or opinion have been made by any
     person to induce this waiver of trial by jury or to modify, limit or
     nullify its effect.

               4.3  Additional Waivers.  Except in the case of any notices
                    ------------------
     specifically required to be given to Debtor by Secured Party, any
     Lender, Issuing Bank or any Noteholder pursuant to this Agreement, any
     of the Lender Documents or any of the Noteholder Documents, Debtor
     hereby waives notice of each and every one of the following acts,
     events and/or conditions and agrees that, without necessity for any
     express reservation of rights against Debtor, neither the occurrence
     or existence of any such act, event or condition, nor Secured Party's,
     any Lender's, Issuing Bank's or any Noteholder's commission of or
     omission to do any such act, event or condition, in any number of
     instances, shall in any way release, discharge, impair or diminish any
     of the Secured Obligations, except as otherwise specifically agreed by
     Secured Party in writing:  (a) the amendment, modification, renewal,
     extension or refinancing of, or the granting by Secured Party, any
     Lender, Issuing Bank or any Noteholder of any indulgence of any nature
     with respect to, or the invalidity, voidability, unenforceability,
     compromise, settlement, release, waiver, discharge or impairment, in
     whole or in part, of, any of the Secured Obligations or any obligation
     of any Other Obligor with respect to any of the Secured Obligations;
     (b) any defense of Debtor or any Other Obligor to payment of any of
     the Secured Obligations; (c) the addition of any maker, guarantor,
     surety, endorser, indemnitor or other person primarily or secondarily
     liable for or obligated upon any of the Secured Obligations;
     (d) assumption of any of the Secured Obligations by any other person,
     whether by assignment, sale, merger, consolidation, sublease,
     conveyance or otherwise; (e) delivery to Secured Party, any Lender,
     Issuing Bank or any Noteholder or acceptance by Secured Party, any
     Lender, Issuing Bank or any Noteholder of any promissory note or other
     instrument or writing evidencing or otherwise relating to any of the
     Secured Obligations; (f) the institution of any suit, the obtaining of
     any judgment or the exercise of any other right or remedy against
     Debtor or any Other Obligor; (g) the sale, exchange, pledge, release,
     disposition,


















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     surrender, loss, destruction, damage to or impairment of, any
     Collateral; (h) the creation, perfection, continuation, amendment,
     modification, invalidity, voidability, unenforceability, compromise,
     settlement, subordination, release, waiver, discharge, impairment or
     loss of priority, in whole or in part, of, any security interest, lien
     other encumbrance directly or indirectly securing any of the
     Obligations; or (i) any other event, circumstance or condition which
     might otherwise constitute a legal or equitable discharge of a
     guarantor, surety or pledgor.  Debtor also hereby waives, to the
     extent the same may be waived under applicable law:  (a) notice of
     acceptance by Secured Party of this Agreement; (b) all claims, causes
     of action and rights of Debtor against Secured Party on account of
     actions taken or not taken by Secured Party in the exercise of Secured
     Party's rights or remedies under this Agreement or under law, provided
     that the same did not arise from Secured Party's negligence or willful
     misconduct; (c) all claims and causes of action of Debtor against
     Secured Party for punitive, exemplary, indirect, special,
     consequential or other non-compensatory damages; (d) all rights of
     redemption of Debtor with respect to any of the Collateral; (e) in the
     event Secured Party seeks to repossess any or all of the Collateral by
     judicial proceedings, any bonds or demands for possession which
     otherwise may be required; (f) all rights of Debtor to have marshalled
     the Collateral or any other security for any of the Secured
     Obligations; (g) diligence in the enforcement or collection of all of
     the Obligations; (h) presentment, protest, notice of protest and
     notice of non-payment with respect to all of the Secured Obligations;
     and (i) any duty or obligation of Secured Party to disclose to Debtor
     any information concerning any other customer or client, or
     prospective customer or client, of Secured Party.  Debtor agrees that
     Secured Party may exercise any or all of its rights and/or remedies
     without resorting to, without regard to, and regardless of the
     adequacy of, any security or other sources of liability with respect
     to any of the Secured Obligations.  Neither any failure nor any delay
     on the part of Secured Party in exercising any right, power or remedy
     shall operate as a waiver thereof, nor shall a single or partial
     exercise thereof preclude any other or further exercise thereof or the
     exercise of any other right, power or remedy.

               4.4 Modifications, Notices.  No modification or waiver of
                   ----------------------
     any provision of this Agreement, and no consent by Secured Party to
     any failure of any of Debtor to comply with any provision of this
     Agreement, shall in any event be effective unless the same shall be in
     writing and signed by the person against whom enforcement thereof is
     sought, and then such waiver or consent shall be effective only in the
     specific instance and for the purpose for which given.  No notice to
     or demand upon Debtor in any circumstance shall entitle Debtor to any
     other or further notice or demand in the same, similar or other
     circumstances.  All notices, requests and demands to or upon the



















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     respective parties hereto to be effective shall be in writing and
     shall be deemed to have been duly given or made when delivered by
     hand, or, if earlier, three (3) calendar days after being deposited in
     the mail, postage prepaid, or when transmitted by telecopy
     transmission, provided that any such notice or communication to Debtor
     shall be hand-delivered or transmitted to Debtor at the Debtor Notice
     Address (or at such other address as Debtor may specify to Secured
     Party in writing from time to time), and any such notice or
     communication to Secured Party shall be hand-delivered or transmitted
     to Secured Party at the Secured Party Notice Address (or at such other
     address as Secured Party may specify to Debtor in writing from time to
     time).

               4.5 Survival, Merger and Counterparts.  All representations,
                   ---------------------------------
     warranties, covenants, conditions and agreements contained herein
     shall survive the execution and delivery hereof.  Debtor shall
     continue to observe, comply with and perform all warranties,
     covenants, conditions and agreements to be observed, complied with or
     performed by Debtor under this Agreement until all of the Lender
     Obligations and all of the Debtor Obligations to each Lender and
     Issuing Bank have been paid in full and there exists no commitment by
     any of Lenders or Issuing Bank which could give rise to any Lender
     Obligations.  This Agreement contains the entire agreement of the
     parties with respect to the matters covered and the transactions
     contemplated hereby and thereby, and no agreement, statement or
     promise made by any party hereto, or by any employee, officer, agent
     or attorney of any party hereto, which is not contained herein or
     therein, shall be valid or binding.  This Agreement may be executed in
     any number of counterparts and by different parties on separate
     counterparts, each of which, when so executed and delivered, shall be
     an original, but all such counterparts shall together constitute one
     and the same agreement.

               4.6 Law, Jurisdiction, Process, Transfers and
                   -----------------------------------------
     Unenforceability.  The performance and construction of this Agreement
     ----------------
     shall be governed by the internal laws of the State of Maryland
     (exclusive of principles of conflicts of laws).  Debtor agrees that
     any suit, action or proceeding with respect to the Collateral or this
     Agreement may be brought in any state or federal court located in the
     State of Maryland.  Debtor consents to the in personam jurisdiction of
                                                -- --------
     such courts and Debtor irrevocably waives any objection to, and any
     right of immunity from, the jurisdiction of such courts or the
     execution of judgments resulting therefrom, on the grounds of venue or
     the convenience of the forum.  In addition, any such suit, action or
     proceeding instituted by Secured Party may be brought in such other
     courts in which jurisdiction and venue may be appropriate.  Debtor
     agrees that service of process in any such suit, action or proceeding
     may be effected by mailing a copy thereof by registered or certified
     mail (or any substantially similar form of mail), postage prepaid, to
     Debtor at the Debtor Notice Address














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     (or at such other address as Debtor may specify to Secured Party in
     writing from time to time).  This Agreement shall be binding upon and
     inure to the benefit of the parties hereto and their respective
     successors and assigns, and each reference in this Agreement to any of
     the parties hereto shall be deemed to include the successors and
     assigns of such party, including, in the case of Debtor, the debtor,
     the debtor in possession and trustee in any case under any chapter of
     the United States Bankruptcy Code in which Debtor is debtor.  Debtor
     may not assign this Agreement or any of its rights hereunder without
     Secured Party's prior written consent.  Subject to applicable law and
     agreements, any of Lenders, Issuing Bank or Noteholders may at any
     time, in its discretion, assign, transfer or pledge to any person, or
     grant to any person a security interest in, this Agreement or any of
     its rights hereunder.  Subject to applicable law and agreements, any
     of Lenders, Issuing Bank or Noteholders may sell, in such amounts,
     upon such terms and to such persons as it may determine,
     participations in its beneficial interests under this Agreement.  If
     any term, provision or condition, or any part thereof, of this
     Agreement shall for any reason be found or held invalid or
     unenforceable by any court or governmental agency, such invalidity or
     unenforceability shall not affect the remainder of such term,
     provision or condition, nor any other term, provision or condition,
     and this Agreement shall survive and be construed as if such invalid
     or unenforceable term, provision or condition had not been contained
     herein or therein; provided, however, that if any rate of interest
     provided under this Agreement does or shall exceed the maximum
     interest rate which Debtor is permitted by law to contract or agree to
     pay, then such rate of interest shall immediately be deemed to be
     reduced to such maximum rate and all previous payments of interest in
     excess of the maximum rate shall be deemed to have been payments in
     reduction of principal and not of interest.

               IN WITNESS WHEREOF, Debtor and Secured Party have duly
     executed this Agreement under seal as of the day and year first
     written above.


     ATTEST/WITNESS:                    FIRST FIDELITY BANK, NATIONAL
                                           ASSOCIATION


     _________________________
     By:__________________________(SEAL)
                                           Michael W. Coiley
                                           Vice President


                                        UNITED INDUSTRIAL
                                           CORPORATION



















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                                        By:__________________________(SEAL)
     -------------------------
                                           Bernard Fein
                                           President
































































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                               SECURITIES EXHIBIT
                               -------------------


     Borrower Securities:

     100 shares of the common stock of Borrower, evidenced by Certificate
     No. 1 issued on January 20, 1977


     Symtron Securities:

     9,983.3 shares of the common stock of Symtron, evidenced by
     Certificate No. 16 issued on January 18, 1994























































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     STATE OF , , SS:


               I HEREBY CERTIFY that on this ____________ day of
     _____________________, 1994, before me, the undersigned, a Notary
     Public of said State, personally appeared Bernard Fein, who
     acknowledged himself to be the President of United Industrial
     Corporation, and that he, as such, being authorized so to do, executed
     the foregoing instrument for the purposes therein contained.

               WITNESS my hand and Notarial Seal.



                                             ______________________________
                                             Notary Public

     My Commission expires:


     --------------------


     STATE OF MARYLAND, CITY OF BALTIMORE, SS:


               I HEREBY CERTIFY that on this ___________ day of
     ______________________, 1994, before me, the undersigned, a Notary
     Public of said State, personally appeared Michael W. Coiley, who
     acknowledged himself to be the Vice President of First Fidelity Bank,
     National Association, and that he, as such, being authorized so to do,
     executed the foregoing instrument for the purposes therein contained.

               WITNESS my hand and Notarial Seal.


                                             ______________________________
                                             Notary Public

     My Commission expires:

             10/1/97
     --------------------






















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                               SECURITY AGREEMENT


     THIS AGREEMENT is made as of the 13th day of October, 1994, by and
     among FIRST FIDELITY BANK, NATIONAL ASSOCIATION, as Agent (in such
     capacity, "Secured Party") for the Lenders, the Issuing Bank and the
     Noteholders (as those terms are hereinafter defined), and AAI
     CORPORATION, a Maryland corporation ("Debtor").


              SECTION 1.  CONSTRUCTION OF AGREEMENT AND DEFINITIONS


     Unless the context otherwise requires, all of the terms used herein
     without definition which are defined by the Maryland Uniform
     Commercial Code shall have the meanings assigned to them by the
     Maryland Uniform Commercial Code except to the extent varied by this
     Agreement.  Unless the context otherwise requires, all capitalized
     terms hereinbefore or hereinafter used in this Agreement without
     definition shall have the meanings assigned to such terms in the
     Credit Agreement.  The phrases "satisfactory to Secured Party,"
     "acceptable to Secured Party" and similar phrases shall mean
     satisfactory or acceptable to Secured Party, in Secured Party's
     discretion exercised in good faith.  The use of the singular herein
     shall also refer to the plural and vice versa, and the use herein of
     any gender, including the neuter, shall also refer to each of the
     other genders, including the neuter.  The captions and headings
     contained in this Agreement are for convenience of reference only and
     shall not affect the meaning, or the construction or interpretation,
     of this Agreement.  In addition to terms defined elsewhere in this
     Agreement, the following terms shall have the following meanings when
     used herein:

               "COLLATERAL" shall mean:  (a) all Receivables, General
     Intangibles, Inventory, Equipment and Computer Hardware and Software,
     each Cash Collateral Account and, in addition, all other property of
     Debtor in which Secured Party has, or may in the future acquire or be
     granted, a security interest hereunder; (b) all amounts now or in the
     future owed by any of Secured Party, Lenders, Issuing Bank or
     Noteholders to Debtor and all property and funds of Debtor (including
     deposit accounts, certificates of deposit, and investments made or
     managed by Secured Party on behalf of Debtor), now owned or hereafter
     acquired by Debtor and now or hereafter in the possession or control
     of any of Secured Party, Lenders, Issuing Bank or Noteholders; (c) all
     present and future substitutions, replacements, appurtenances,
     accessories, accessions and materials and supplies relating to any of
     the foregoing; (d) all present and future books and records of Debtor
     in any form, in or on any media, including data processing materials
     in any form (including software, tapes, disks and the like), whether
     in the possession of Debtor or any other person; and (e) all present
     and


















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     future proceeds and products of all of the foregoing in any form
     whatsoever and all rights, including rights to the payment of money
     for any reason, arising on account of any sale, assignment, lease,
     rental, license, exchange, liquidation, condemnation, taking, theft or
     any disposition of any nature of, or any damage or casualty to, or any
     loss with respect to, any of the foregoing or any rights or interests
     of Debtor in any of the foregoing, including, without limitation, cash
     proceeds (including all payments under any indemnities, warranties or
     guaranties payable with respect to any of the foregoing), non-cash
     proceeds and proceeds acquired with cash proceeds, whether any such
     proceeds constitute consumer goods, farm products, equipment,
     inventory, documents of title, chattel paper, accounts, instruments or
     general intangibles, and all proceeds of insurance policies insuring
     any of the foregoing or any risks to Debtor associated with any of the
     foregoing.

               "COLLATERAL LOCATIONS" shall mean the locations identified
     on the Collateral Locations Exhibit attached hereto.

               "COMPUTER HARDWARE AND SOFTWARE" shall mean:  (a) all of
     Debtor's computer and other electronic data processing hardware,
     integrated computer systems, central processing units, memory units,
     display terminals, printers, features, computer elements, card
     readers, tape drives, hard and soft disk drives, cables, electrical
     supply hardware, generators, power equalizers, accessories and all
     peripheral devices and other related computer hardware, whether now
     owned, licensed or leased or hereafter acquired by Debtor; (b) all
     software programs, including source codes and object codes, whether
     now owned, licensed or leased or hereafter acquired by Debtor,
     designed for use or used on the equipment described in the preceding
     clause (a), and all firmware associated therewith, whether now owned,
     licensed or leased or hereafter acquired by Debtor; and (c) all
     present and future manuals and other written materials and
     documentation (and packaging thereof or relating thereto) for such
     equipment, software or firmware, whether now owned, licensed or leased
     or hereafter acquired by Debtor.

               "COPYRIGHT RIGHTS" shall mean all right, title and interest
     of Debtor, whether now owned or existing or hereafter acquired or
     arising, in and to all domestic and foreign copyrights, copyright
     registrations and copyright applications, whether or not registered or
     filed with any Governmental Authority, together with (a) all renewals
     thereof, (b) all present and future rights of Debtor under all present
     and future license agreements relating thereto, whether Debtor is
     licensee or licensor thereunder, (c) all income, royalties, damages
     and payments now or hereafter due and/or payable to Debtor thereunder
     or with respect thereto, including, without limitation, damages and
     payments for past, present or future infringements thereof, (d) all
     present and future claims of Debtor, causes of action of



















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     Debtor and rights of Debtor to sue for past, present or future
     infringements thereof, and (e) all rights corresponding thereto
     throughout the world, other than as may hereafter be transferred or
     licensed by Debtor to IMAX Corporation or Ridefilm Corporation, or any
     of their successors or assigns, in connection with the sale of
     Debtor's Entertainment Business.

               "CREDIT AGREEMENT" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Credit Agreement of even date herewith
     among Debtor, Secured Party, Lenders and Issuing Bank.

               "DEBTOR NOTICE ADDRESS" shall mean York Road and Industry
     Lane, Hunt Valley, Maryland 21030.

               "EQUIPMENT" shall mean:  (a) all equipment of Debtor of
     every type and description, now owned and hereafter acquired and
     wherever located, including, without limitation, all machinery,
     vehicles and other rolling stock, furniture, furnishings, tools, dies,
     leasehold improvements, fixtures, and materials and supplies relating
     to any of the foregoing; (b) all present and future documents of title
     and trust receipts relating to any of the foregoing; (c) all present
     and future rights, claims and causes of action of Debtor in connection
     with purchases by Debtor of (or contracts for the purchase by Debtor
     of), or warranties relating to, or damages to, goods held or to be
     held by Debtor as equipment; (d) all present and future warranties,
     manuals and other written materials (and packaging thereof or relating
     thereto) relating to any of the foregoing; and (e) all present and
     future rights, claims and causes of action of Debtor in connection
     with any agreements pursuant to which any suppliers, manufacturers or
     other persons have agreed or may agree, conditionally or otherwise, to
     purchase or repurchase from Debtor, in bulk or otherwise, any goods
     held or to be held by Debtor as equipment.

               "EVENT OF DEFAULT" shall mean an "Event of Default," as
     defined in the Credit Agreement, or an "Event of Default," as defined
     in the Note Purchase Agreement.

               "GENERAL INTANGIBLES" shall mean all present and future
     personal property, interests and rights of Debtor (including things in
     action), other than goods, accounts, chattel paper, documents,
     instruments and money, but including, without limitation:  (a) all
     Intellectual Property; (b) all uncertificated capital stock and other
     securities, partnership interests, joint venture interests and other
     investments and similar interests of Debtor, whether now owned or
     hereafter acquired by Debtor (other than Debtor's equity and joint
     venture interests in Transit), together with all present and future
     rights, titles, interests, powers, authorities, options,




















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     warrants, privileges and benefits thereof or accruing or in any way
     relating thereto, and all present and future claims, rights, titles
     and interests of Debtor in and to all present and future payments,
     receipts, collections, profits, revenues, dividends, distributions,
     surplus, income, entitlements, exchanges, benefits and other proceeds
     and avails thereof or in any way relating thereto; and (c) all present
     and future customer lists of Debtor. 

               "GOOD FAITH" shall mean, with respect to a determination,
     request or other action to be made or taken by Secured Party "in good
     faith," that Secured Party shall make or take such determination,
     request or other action honestly and not maliciously.

               "INTELLECTUAL PROPERTY" shall mean:  (a) all Copyright
     Rights; (b) all Patent Rights; (c) all Trademark Rights; (d) all
     License Rights; (e) all goodwill of Debtor; (f) all present and future
     trade secrets of Debtor; and (g) all other present and future
     intellectual property of Debtor.

               "INTERCREDITOR AGREEMENT" shall mean, as the same may be
     waived, amended, modified, extended, renewed, supplemented or replaced
     from time to time, that certain Intercreditor Agreement of even date
     herewith among Secured Party, Lenders, Issuing Bank and Noteholders.

               "INVENTORY" shall mean:  (a) all inventory of Debtor of
     every type and description, now owned and hereafter acquired and
     wherever located, including, without limitation, raw materials, work
     in process, finished goods, goods returned or repossessed, and goods
     held for demonstration, marketing or similar purposes; (b) all present
     and future materials and supplies of Debtor used, usable or consumed
     in the course of business of Debtor, whether relating to the
     manufacture, assembly, installation, repair, packaging, packing or
     shipment of goods by Debtor, or relating to advertising or any other
     aspect of any business of Debtor; (c) all present and future property
     of Debtor in or on which any of the foregoing is stored or maintained;
     (d) all present and future warranties, manuals and other written
     materials (and packaging thereof or relating thereto) relating to any
     of the foregoing; (e) all present and future documents of title and
     trust receipts relating to any of the foregoing; (f) all present and
     future customer lists of Debtor; (g) all present and future rights of
     Debtor in connection with goods consigned to or by Debtor; (h) all
     present and future rights of Debtor as an unpaid seller of goods,
     including rights of stoppage in transit, detinue and reclamation;
     (i) all present and future rights, claims and causes of action of
     Debtor in connection with purchases by Debtor of (or contracts for the
     purchase by Debtor of), or warranties relating to, or damages to,
     goods held or to be held by Debtor as inventory; and (j) all present
     and future rights, claims and




















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     causes of action of Debtor in connection with any agreements pursuant
     to which any suppliers, manufacturers or other persons have agreed or
     may agree, conditionally or otherwise, to purchase or repurchase from
     Debtor, in bulk or otherwise, any goods held or to be held by Debtor
     as inventory.

               "ISSUING BANK" shall mean the person from time to time party
     to the Credit Agreement as "Issuing Bank."

               "LENDER DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, the Credit Agreement, the Revolving Credit Notes, the
     Borrower Pledge Agreement, the Deed of Trust, the Guaranty, the
     Guarantor Security Agreement, the UIC Pledge Agreement, the UIC
     Subordination Agreement, the UIC-DEL Subordination Agreement, the L/C
     Agreements, this Agreement, and any and all other agreements,
     contracts, promissory notes and other instruments, security
     agreements, assignments, pledge agreements, indemnification
     agreements, mortgages, deeds of trust, leases, guaranties and other
     documents now or hereafter existing and evidencing, securing (directly
     or indirectly), guaranteeing (or in effect guaranteeing) or
     indemnifying (or in effect indemnifying) any of Lenders or Issuing
     Bank with respect to, any of the aforementioned documents or any
     obligations of any person to any of Lenders or Issuing Bank
     thereunder.

               "LENDER OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, refinanced,
     consolidated or replaced from time to time, all present and future
     Revolving Credit Loans, L/C Reimbursement Obligations and other
     obligations, indebtedness and liabilities of Debtor to each of Lenders
     and Issuing Bank arising under, evidenced by or in connection with the
     Credit Agreement or the other Lender Documents, including, without
     limitation, all principal amounts, including future advances,
     indemnification obligations, interest charges, fees, premiums,
     commissions and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Debtor under or in connection with the Credit
     Agreement or the other Lender Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing, and including, without limitation, all claims
     against Debtor arising or re-arising on account of or as a result of
     any payment made by Debtor or any other person with respect to any
     obligations included in this definition which is rescinded or
     recovered from any of Lenders or Issuing Bank or restored or returned
     by any of Lenders or Issuing Bank under authority of any law, rule,
     regulation, order of court or Governmental Authority, or in connection
     with any compromise or settlement relating thereto or


















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     relating to any pending or threatened action, suit or proceeding
     relating thereto, whether arising out of any proceedings under the
     United States Bankruptcy Code or otherwise.  

               "LENDERS" shall mean the persons from time to time parties
     to the Credit Agreement as "Lenders."

               "LICENSE RIGHTS" shall mean all present and future licenses
     and license agreements of Debtor, and all rights of Debtor under or in
     connection therewith, whether Debtor is licensee or licensor
     thereunder, including, without limitation, any present or future
     franchise agreements under which Debtor is franchisee or franchisor,
     together with (a) all renewals thereof, (b) all income, royalties,
     damages and payments now or hereafter due and/or payable to Debtor
     thereunder or with respect thereto, including, without limitation,
     damages and payments for past, present or future infringements
     thereof, (c) all claims, causes of action and rights to sue for past,
     present or future infringements thereof, and (d) all rights
     corresponding thereto throughout the world.

               "NOTE PURCHASE AGREEMENT" shall mean, as the same has been
     or may hereafter be amended, modified, extended, renewed, supplemented
     or replaced from time to time, that certain Note Purchase Agreement
     dated July 15, 1992, among Debtor and Noteholders.

               "NOTEHOLDER DOCUMENTS" shall mean, as the same have been or
     may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, the Note Purchase
     Agreement, the Noteholder Notes, the UIC Noteholder Guaranty and any
     and all other agreements, contracts, promissory notes and other
     instruments, security agreements, assignments, pledge agreements,
     indemnification agreements, mortgages, deeds of trust, leases,
     guaranties and other documents now or hereafter existing and
     evidencing, securing, directly or indirectly, guaranteeing (or in
     effect guaranteeing) or indemnifying (or in effect indemnifying)
     Noteholders with respect to, any of the aforementioned documents or
     any obligations of any person to Noteholders thereunder.

               "NOTEHOLDER NOTES" shall mean, as the same have been or may
     hereafter be amended, modified, extended, renewed, supplemented or
     replaced from time to time, that certain 8.65% Senior Note Due
     July 31, 1999, dated August 11, 1992, issued by Debtor to TRAL & CO,
     nominee of The Travelers Insurance Company, pursuant to the Note
     Purchase Agreement in the original principal amount of $9,000,000.00,
     that certain 8.65% Senior Note Due July 31, 1999, dated August 11,
     1992, issued by Debtor to TRAL & CO, nominee of The Travelers
     Indemnity Company of Rhode Island, pursuant to the Note Purchase
     Agreement in the original principal amount of $3,000,000.00 and
     assigned by The Travelers Indemnity



















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     Company of Rhode Island to The Travelers Insurance Company, that
     certain 8.65% Senior Note Due July 31, 1999, dated August 11, 1992,
     issued by Debtor to Principal Mutual Life Insurance Company pursuant
     to the Note Purchase Agreement in the original principal amount of
     $10,000,000.00, and that certain 8.65% Senior Note Due July 31, 1999,
     dated August 11, 1992, issued by Debtor to Principal Mutual Life
     Insurance Company pursuant to the Note Purchase Agreement in the
     original principal amount of $3,000,000.00.

               "NOTEHOLDER OBLIGATIONS" shall mean, as the same have been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented, refinanced, consolidated or replaced from time to time,
     all present and future obligations, indebtedness and liabilities of
     Debtor to each of Noteholders arising under, evidenced by  or in
     connection with the Noteholder Documents, including, without
     limitation, principal amounts (but not including any additional loans
     or advances by Noteholders to Debtor), interest charges, fees,
     premiums and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Debtor to each of Noteholders under or in
     connection with the Noteholder Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing and including, without limitation, all claims
     against Debtor arising or re-arising on account of or as a result of
     any payment made by Debtor or any other person with respect to any
     obligations included in this definition which is rescinded or
     recovered from any of Noteholders or restored or returned by any of
     Noteholders under authority of any law, rule, regulation, order of
     court or Governmental Authority, or in connection with any compromise
     or settlement relating thereto or relating to any pending or
     threatened action, suit or proceeding relating thereto, whether
     arising out of any proceedings under the United States Bankruptcy Code
     or otherwise.  

               "NOTEHOLDERS" shall mean, collectively, Principal Mutual
     Life Insurance Company, an Iowa corporation, and The Travelers
     Insurance Company, a Connecticut corporation.

               "PATENT RIGHTS" shall mean all right, title and interest of
     Debtor, whether now owned or existing or hereafter acquired or
     arising, in and to all United States and foreign patents, and pending
     United States and foreign patent applications, including, without
     limitation, the inventions and improvements described or claimed
     therein (other than the patent application for the Three Axis Motion
     Platform filed October 1, 1993, to be assigned by Debtor to IMAX
     Corporation or Ridefilm Corporation, or their successors or assigns,
     in connection with the sale of Debtor's Entertainment Business),
     together with


















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     (a) any reissues, divisions, continuations, certificates of re-
     examination, extensions and continuations-in-part thereof, (b) all
     present and future rights of Debtor under all present and future
     license agreements relating thereto, whether Debtor is licensee or
     licensor thereunder, (c) all income, royalties, damages and payments
     now or hereafter due and/or payable to Debtor thereunder or with
     respect thereto, including, without limitation, damages and payments
     for past, present or future infringements thereof, (d) all present and
     future claims of Debtor, causes of action of Debtor and rights of
     Debtor to sue for past, present or future infringements thereof, and
     (e) all rights corresponding thereto throughout the world.

               "PERSON" shall mean any individual, corporation, limited
     liability company, partnership, joint venture, association, trust,
     business trust, Governmental Authority (or subdivision, agency or
     department thereof) or other entity of any kind.

               "RECEIVABLES" shall mean:  (a) all present and future
     accounts, contract rights, receivables, chattel paper, documents and
     promissory notes and other negotiable and non-negotiable instruments
     of Debtor, including, without limitation, that certain Mortgage Note
     dated March 23, 1993, executed and delivered in favor of Debtor by
     Timothy O'Brien in the original principal amount of Four Hundred
     Eighty-Eight Thousand Seven Hundred Fifty Dollars ($488,750.00) and
     all promissory notes heretofore or hereafter delivered to Debtor by
     Pioneer, and all certificated securities (other than certificated
     securities evidencing capital stock of Transit) and other certificates
     evidencing capital stock of any person or any other ownership, equity
     or other rights in any person or property, together with all present
     and future rights, titles, interests, powers, authorities, options,
     warrants, privileges and benefits thereof or accruing or in any way
     relating thereto, and all present and future claims, rights, titles
     and interests of Debtor in and to all present and future payments,
     receipts, collections, profits, revenues, dividends, distributions,
     surplus, income, entitlements, exchanges, benefits and other avails
     thereof or in any way relating thereto; (b) all present and future tax
     refunds of Debtor and all present and future rights of Debtor to
     refunds or returns of prepaid expenses, including unearned insurance
     premiums; (c) all present and future cash of Debtor; (d) all present
     and future proceeds of Revolving Credit Loans; (e) all deposit
     accounts now or hereafter maintained or established by, for or on
     behalf of Debtor with any bank or other institution, and all balances
     of funds now or hereafter on deposit in all such accounts, including,
     without limitation, all checking accounts, collection accounts,
     lockbox accounts, disbursement accounts, concentration accounts and
     all other deposit accounts of every kind and nature; (f) all present
     and future judgments, orders, awards and decrees in favor of Debtor
     and causes of action in




















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     favor of Debtor; (g) all present and future claims, rights of
     indemnification and other rights of Debtor under or in connection with
     any contracts or agreements to which Debtor is or becomes a party or
     third party beneficiary; (h) all rights and claims of Debtor with
     respect to any deposits of money or other property made with any
     lessors of any property, insurers, bonding agents or any other
     persons; (i) all present and future rights and claims which Debtor may
     now or hereafter have under any insurance policies, contracts or
     coverages now or hereafter in effect; (j) all goods previously or
     hereafter returned, repossessed or stopped in transit, the sale, lease
     or other disposition of which contributed to the creation of any
     account, instrument or chattel paper of Debtor; (k) all present and
     future rights of Debtor as an unpaid seller of goods, including rights
     of stoppage in transit, detinue and reclamation; (l) all rights which
     Debtor may now or at any time hereafter have, by law or agreement,
     against any account debtor or other obligor of Debtor, and all rights,
     liens and security interests which Debtor may now or at any time
     hereafter have, by law or agreement, against any property of any
     account debtor or other obligor of Debtor; (m) all present and future
     interests and rights of Debtor, including rights to the payment of
     money, under or in connection with all present and future leases and
     subleases of real or personal property to which Debtor is a party, as
     lessor, sublessor, lessee or sublessee; and (n) all present and future
     contingent and noncontingent rights of Debtor to the payment of money
     for any reason whatsoever, whether arising in contract, tort or
     otherwise, whether or not such rights are otherwise included in this
     definition.

               "SECURED OBLIGATIONS" shall mean, collectively, the Lender
     Obligations and the Noteholder Obligations.

               "SECURED PARTY NOTICE ADDRESS" shall mean 123 South Broad
     Street, Philadelphia, Pennsylvania 19109.

               "TRADEMARK RIGHTS" shall mean all right, title and interest
     of Debtor, whether now owned or existing or hereafter acquired or
     arising, in and to all domestic and foreign servicemarks, servicemark
     registrations, servicemark applications, trademarks, trademark
     registrations, trademark applications and trade names, whether or not
     registered or filed with any Governmental Authority, together with
     (a) all renewals thereof, (b) all present and future rights of Debtor
     under all present and future license agreements relating thereto,
     whether Debtor is licensee or licensor thereunder, (c) all income,
     royalties, damages and payments now or hereafter due and/or payable to
     Debtor thereunder or with respect thereto, including, without
     limitation, damages and payments for past, present or future
     infringements thereof, (d) all present and future claims of Debtor,
     causes of action of Debtor and rights of Debtor to sue for past,
     present or future infringements thereof, and (e) all rights
     corresponding thereto throughout the world.


















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               "UIC NOTEHOLDER GUARANTY" shall mean, as the same may have
     been or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Guaranty
     Agreement dated July 15, 1992, executed and delivered by UIC in favor
     of Noteholders.


                  SECTION 2.  SECURITY INTEREST AND COLLATERAL


     2.1Grant of Security Interest.  As security for the Secured
        --------------------------
     Obligations, Debtor hereby grants to Secured Party, for the ratable
     benefit of Lenders, Issuing Bank and Noteholders according to the
     provisions of this Agreement and the Intercreditor Agreement, a lien
     and continuing security interest in, and pledges and assigns to
     Secured Party, for the ratable benefit of Lenders, Issuing Bank and
     Noteholders according to the provisions of this Agreement and the
     Intercreditor Agreement, the Collateral.  Even if any of the Secured
     Obligations shall at any time or from time to time be paid in full,
     Secured Party's security interest shall continuously exist until all
     of the Lender Obligations have been paid in full and there exists no
     commitment by any of Lenders or Issuing Bank which could give rise to
     any Lender Obligations.

               2.2 Notices, Additional Documents.  Debtor agrees to execute
                   -----------------------------
     and deliver to Secured Party, or cause to be executed and delivered to
     Secured Party, from time to time promptly after request by Secured
     Party and in form and content satisfactory to Secured Party, such
     security agreements, financing statements, amendments of financing
     statements, assignments of financing statements, security interest
     filing statements, mortgages, deeds of trust, assignments, notices,
     consents and other documents as Secured Party may request in good
     faith in order to confirm, supplement, preserve, protect or perfect,
     or to maintain the perfection of, Secured Party's security interest in
     the Collateral and Secured Party's rights under this Agreement.  If
     any Intellectual Property, or any interest therein, shall, to the
     knowledge of Debtor, become the subject of any application,
     registration or other filing with any Governmental Authority, Debtor
     agrees to notify Secured Party thereof within fifteen (15) Business
     Days after any such filing.  If any Receivable arises out of a
     contract with the United States of America or any state, county,
     municipality or other Governmental Authority, or any department or
     agency thereof, Debtor agrees to notify Secured Party thereof within
     ten (10) Business Days after execution of such contract and Debtor
     agrees, if requested by Secured Party, to execute and deliver to
     Secured Party, or cause to be executed and delivered to Secured Party,
     from time to time promptly after request by Secured Party and in form
     and content satisfactory to Secured Party, such agreements, notices,
     consents, assignments, acknowledgments and other documents as Secured
     Party may request
















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     in good faith, and to do such other things as Secured Party may
     request in good faith, in order that all sums due and to become due to
     Debtor under or in connection with such contract shall be duly
     assigned and paid to Secured Party in accordance with the Federal
     Assignment of Claims Act and/or any other laws, rules and regulations
     relating to the assignment or payment of such conract and sums.

               2.3 Additional Warranties, Agreements Concerning Collateral.
                   -------------------------------------------------------
     Debtor warrants and agrees that:  (a) no financing statement,
     mortgage, deed of trust, assignment, notice of lien or other security
     document publicizing a security interest in or lien upon any of the
     Collateral is or will be on file in any recording or filing office,
     except for financing statements or other security documents
     publicizing Permitted Liens (other than liens for taxes) or security
     interests or other liens with respect to which effective and
     recordable termination statements or other releases have been
     delivered to Secured Party, and the Collateral is and shall remain
     free and clear of all Liens except for Permitted Liens; (b) no
     Intellectual Property of Debtor is the subject of any application,
     registration or other filing with any Governmental Authority (other
     than foreign Governmental Authorities), including the United States
     Patent and Trademark Office and the United States Copyright Office,
     except as set forth on the Intellectual Property Exhibit attached
     hereto; (c) Debtor will not, without Secured Party's prior written
     consent, sell, assign, transfer, convey or lease, or suffer or permit
     to occur any sale, assignment, transfer, conveyance or lease of, any
     of the Collateral, or any interest therein, except for transactions in
     the ordinary course of business and except for transactions expressly
     permitted by the Credit Agreement; (d) except as otherwise heretofore
     disclosed to Secured Party in writing and except for (i) vehicles of
     Debtor, (ii) Collateral in transit to Debtor or to job sites of
     Debtor, (iii) Collateral at job sites of Debtor, (iv) the Prototype
     Ground Data Terminal with Shelter and the Prototype Mission Planning
     and Control Station with Shelter and Cabling located in Seattle,
     Washington, and (v) mobile goods of a type normally used in more than
     one jurisdiction, all of the tangible Collateral not in Secured
     Party's possession is located at the Collateral Locations and, unless
     Secured Party shall consent otherwise in writing, shall remain located
     at the Collateral Locations; (e) in the case of any item of Equipment
     or Inventory having a fair market value of Five Hundred Thousand
     Dollars ($500,000.00) or more which is located at any location or
     locations other than the Collateral Locations for a period of four (4)
     months or more, keep Secured Party informed at all times of the
     location of such Equipment or Inventory; (f) Debtor will not, without
     Secured Party's prior written consent, store or place any Collateral
     with any warehouseman, artisan, processor, contractor or bailee,
     except in the ordinary course of business of Debtor as now being
     conducted; (g) Debtor will use prudent business judgment in extending
     credit


















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     to account debtors and other customers of Debtor; (h) Debtor will not
     permit, consent to or agree to, without Secured Party's prior written
     consent, any material extension, modification or compromise of any
     kind with respect to any Receivable, other than in the ordinary course
     of business of Debtor; (i) whenever requested by Secured Party and
     periodically if Secured Party shall so request, Debtor will promptly
     deliver to Secured Party, with such indorsements and/or assignments as
     Secured Party may from time to time request in good faith, all
     promissory notes and other instruments, certificates, chattel paper,
     guaranties and documents of title, as well as other documents
     requested by Secured Party, previously or hereafter coming into the
     possession or control of Debtor and constituting, evidencing,
     securing, guaranteeing or otherwise relating to, any of the Collateral
     or proceeds of any of the Collateral; (j) no check, draft, money order
     or other item of payment made or applied on account of any of the
     Obligations shall constitute a final payment to Secured Party unless
     and until the item of payment shall be honored and finally paid to
     Secured Party in immediately available funds; and (k) a carbon,
     photographic or other reproduction of this Agreement or any financing
     statement signed by Debtor in connection with this Agreement shall be
     sufficient as a financing statement.

               2.4 Collateral Collections.  (a) Debtor shall deposit in a
                   ----------------------
     Cash Collateral Account, not later than the second Business Day
     following the day on which the same are received, all cash, checks,
     drafts, money orders and other items of payment constituting
     Collateral, or collections or other proceeds of Collateral.  Secured
     Party shall have the right at any time and from time to time, at its
     option, to notify, and/or to require Debtor to notify, any or all
     account debtors and other obligors of Debtor in connection with
     accounts, promissory notes or other instruments, guaranties, chattel
     paper, security agreements, contract rights, tax refunds or other
     Receivables or General Intangibles of Debtor, or in connection with
     any or all other obligations, indebtedness or liabilities payable to
     Debtor, to make payments thereon directly to Secured Party or in care
     of a post office lockbox which shall be maintained by Secured Party,
     subject to Secured Party's customary arrangements and charges therefor
     as established by Secured Party from time to time and which shall be
     under the exclusive control of Secured Party, which payments shall be
     deposited by Secured Party in a Cash Collateral Account.

                   (b)  On each Business Day, Secured Party will transfer
     to the First Fidelity Cash Collateral Account any balance of funds in
     any other Cash Collateral Account.  On each Business Day, Secured
     Party will transfer any balance of funds in the First Fidelity Cash
     Collateral Account and apply the same to pay any Base Rate Loans then
     outstanding.  To the extent that any such balance of funds so applied
     consists of any items deposited



















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     or credited to the First Fidelity Cash Collateral Account which have
     not been finally collected and paid, such application shall be
     provisional and subject to revocation in the event any such items are
     not finally collected and paid.  Upon request by Debtor from time to
     time, Secured Party will transfer to or for Debtor, or as directed by
     Debtor, any balance of collected funds in the Cash Collateral Accounts
     in excess of the amount of contingent and noncontingent Secured
     Obligations.

                   (c)  Secured Party shall have the right to indorse the
     name or names of Debtor on any promissory notes or other instruments,
     acceptances, checks, drafts, money orders or other items of payment
     constituting Collateral, or collections or other proceeds of
     Collateral, that may come into Secured Party's possession or control
     from time to time.  Secured Party shall also have the right to send,
     or to require Debtor to send, to account debtors and other obligors of
     Debtor from time to time requests for verification of accounts and
     other amounts which may be due to Debtor.

                   (d)  Nothing contained in this Subsection shall, or
     shall be construed to, affect, limit, diminish or in any way impair
     any security interest, right of setoff or other Lien of Secured Party,
     any of Lenders, Issuing Bank or any of Noteholders under any of the
     Lender Documents or any of the Noteholder Documents.  Debtor
     acknowledges its understanding and agreement that the services to be
     performed by Secured Party for Debtor under Subsection 2.4(b) of this
     Agreement are provided by Secured Party as a service accommodation to
     Debtor and do not constitute conditions to, or consideration for, any
     of the Lender Obligations.  Debtor agrees that Secured Party shall
     have no liability to Debtor, and Debtor shall not be entitled to any
     reduction in interest, fees, commissions or other amounts charged to
     Debtor or owing under the Credit Agreement or otherwise on account of
     any failure of Secured Party to cause any reduction to be made in any
     Base Rate Loans outstanding pursuant to Subsection 2.4(b) of this
     Agreement.

               2.5 Insurance Proceeds.  Debtor hereby assigns to Secured
                   ------------------
     Party all proceeds of all insurance policies and coverages insuring
     any of the Collateral or any risks associated with any of the
     Collateral.  After the occurrence and during the continuance of a
     Default or an Event of Default, Debtor authorizes and directs each
     insurance company to pay all such proceeds directly and solely to
     Secured Party and not to Debtor and Secured Party jointly, and
     authorizes and empowers Secured Party to adjust or compromise any loss
     under such policies, to collect and receive all such proceeds, and,
     for those purposes, to execute and indorse in the name of Debtor all
     proofs of loss, drafts, checks and any other documents or instruments,
     and any persons making payments to Secured Party under the terms of
     this provision are hereby relieved absolutely from any obligation or


















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     responsibility to see to the application of any sums so paid, which
     sums, after deduction of all costs and expenses (including reasonable
     attorneys' fees) paid or incurred by Secured Party in the collection
     and handling thereof, may be applied, at Secured Party's option but
     subject to applicable law and agreements, either toward replacing or
     restoring the Collateral, in a manner and on terms satisfactory to
     Secured Party, or as a credit against such of the Secured Obligations,
     whether matured or unmatured, as Secured Party shall determine in its
     discretion.  Except when a Default or an Event of Default shall have
     occurred and be continuing, Debtor shall have the right to collect the
     proceeds of any such policies, provided that all such proceeds
     collected by Debtor are either applied promptly by Debtor to
     repairing, replacing or restoring the Collateral, in a manner and on
     terms satisfactory to Secured Party, or paid promptly by Debtor to
     Secured Party for application against such of the Obligations, whether
     matured or unmatured, as Secured Party shall determine in its
     discretion but subject to applicable law and agreements.



















































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                               SECTION 3.  DEFAULT


     3.1Remedies.  Upon and at any time after the occurrence and during the
        --------
     continuance of any Event of Default, Secured Party may, without notice
     or demand, exercise in any jurisdiction in which enforcement hereof is
     sought, the following rights and remedies, in addition to all other
     rights and remedies available to Secured Party, Lenders, Issuing Bank
     and Noteholders under the Lender Documents and the Noteholder
     Documents, the rights and remedies of a secured party under the
     Uniform Commercial Code and all other rights and remedies available to
     Secured Party under law, all such rights and remedies being cumulative
     and enforceable alternatively, successively or concurrently:  (a) take
     exclusive possession of any or all of the Collateral from time to time
     and/or place a custodian in exclusive possession of any or all of the
     Collateral from time to time and, so far as Debtor may give authority
     therefor, enter upon any premises on which any of the Collateral may
     be situated and remove the same therefrom, Debtor hereby waiving any
     and all rights to prior notice and to judicial hearing with respect to
     repossession of Collateral, and/or require Debtor, at Debtor's
     expense, to assemble and deliver any or all of the Collateral to such
     place or places as Secured Party may reasonably request; (b) enforce
     the liens and security interests granted to Secured Party hereunder by
     collecting or liquidating all or any part of the Collateral or
     selling, assigning, leasing, renting, licensing or otherwise disposing
     of all or any part of the Collateral or any interest therein, in one
     or more parcels, at the same or different times, at public or private
     sale or disposition, or otherwise; (c) demand, compromise, collect,
     sue for and receive any money or property at any time due, payable or
     receivable on account of any or all accounts, promissory notes or
     other instruments, guaranties, chattel paper, security agreements,
     contract rights, tax refunds or other Receivables or General
     Intangibles of Debtor, or on account of any or all other debts,
     liabilities or obligations payable to Debtor; (d) institute any
     proceeding or proceedings to enforce any security interests, liens or
     other rights or interests of Secured Party hereunder; (e) sign the
     name of Debtor on any invoices to, drafts against and other notices
     and documents to account debtors or other obligors of Debtor and
     requests for verification of accounts and other amounts which may be
     due to Debtor; (f) execute proofs of claim and loss on behalf of
     Debtor; (g) subject to applicable law and agreements, apply all
     Collateral and proceeds of Collateral delivered to Secured Party or
     coming into Secured Party's possession or control from time to time to
     such of the Secured Obligations, whether matured or unmatured, as
     Secured Party may determine in its discretion, or hold the same as
     security for any contingent or future Secured Obligations; (h) at
     Debtor's expense, continue or complete, or cause to be continued or
     completed, performance of obligations of Debtor under any



















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     contracts of Debtor, and collect all income and revenues therefrom;
     and/or (i) use, operate, manage, control and exercise all rights of
     Debtor relating to, the Collateral and any other assets of Debtor, and
     collect all income and revenues therefrom.

               3.2 Collateral Dispositions.  Debtor agrees that commercial
                   -----------------------
     reasonableness and good faith require Secured Party to give Debtor no
     more than ten (10) days prior written notice of the time and place of
     any public disposition of Collateral or of the time after which any
     private disposition or any other intended disposition is to be made. 
     All sales or other dispositions of Collateral may be made for cash,
     upon credit or for future delivery.  In no event shall Debtor be
     credited with any part of the proceeds of liquidation, sale or other
     disposition of any Collateral until final payment thereon has been
     received by Secured Party in immediately available funds, and Secured
     Party shall have no obligation to delay any liquidation, sale or other
     disposition because the same may result in the imposition of any
     forfeiture, premium or penalty.

               3.3 Expenses.  Debtor agrees to pay to Secured Party, each
                   --------
     Lender, each Noteholder and Issuing Bank upon its demand from time to
     time, the amount of all expenses, including reasonable attorneys' fees
     and expenses, paid or incurred by it (a) in exercising or enforcing or
     consulting with counsel concerning, any of its rights hereunder or
     under law, or (b) in defending any and all non-meritorious or
     previously waived demands, claims, counterclaims, cross-claims, causes
     of action, litigation and proceedings of every kind and nature
     asserted, commenced or instituted against it or any of its officers,
     directors, employees or agents, by Debtor, any Subsidiary of Debtor or
     any Other Obligor on account of, as a result of or relating to, any
     action taken or not taken by Secured Party, any Lender, any Noteholder
     or Issuing Bank in connection with the Collateral or enforcement or
     exercise by it of any of its rights or remedies under this Agreement
     or under law.  Debtor also agrees to pay to Secured Party, each
     Lender, each Noteholder and Issuing Bank upon its demand from time to
     time, interest on the outstanding amount of such expenses, from the
     date of demand for payment of such expenses until the same are paid in
     full, at the rate from time to time applicable to Base Rate Loans.




























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                        SECTION 4.  ADDITIONAL PROVISIONS


     4.1Further Assurances, Power of Attorney.  Debtor agrees promptly to
        -------------------------------------
     do, make, execute and deliver all such additional and further acts,
     things, deeds, assurances, instruments and documents as Secured Party
     may request in good faith to vest in and assure to Secured Party its
     rights hereunder or in any of the Collateral.  Debtor hereby appoints
     Secured Party and its designees as attorney-in-fact of Debtor,
     irrevocably and with power of substitution, with authority to execute
     and deliver from time to time, in the name and stead of Debtor, all
     documents which Debtor is required to, but has failed or refused to,
     execute and deliver to Secured Party pursuant to this Agreement, and
     with authority to take all of the actions from time to time on behalf
     of Debtor, and in the name and stead of Debtor, which Secured Party is
     authorized to take under this Agreement or which Secured Party in its
     discretion exercised in good faith deems necessary or advisable in
     order to cause Debtor to be in compliance with any of the terms of
     this Agreement or in order to carry out and enforce this Agreement. 
     Said attorney or designee shall not be liable for any acts of
     commission or omission nor for any error of judgment or mistake of
     fact or law which does not arise from its gross negligence or willful
     misconduct.  This power of attorney is coupled with an interest and is
     irrevocable so long as any of the Secured Obligations remain unpaid or
     unperformed or there exists any commitment by Lenders or Noteholders
     which could give rise to any Secured Obligations.

               4.2 Waiver of Trial by Jury.  Each of Debtor and Secured
                   -----------------------
     Party agrees that any action, suit or proceeding involving any claim,
     counterclaim or cross-claim arising out of or in any way relating,
     directly or indirectly, to this Agreement, or any liabilities, rights
     or interests of Debtor, Secured Party or any other person arising out
     of or in any way relating, directly or indirectly, to this Agreement,
     shall be tried by a court and not by a jury.  Debtor and Secured Party
     hereby waives any right to trial by jury in any such action, suit or
     proceeding, with the understanding and agreement that this waiver
     constitutes a waiver of trial by jury of all claims, counterclaims and
     cross-claims against all parties to such actions, suits or
     proceedings, including claims, counterclaims and cross-claims against
     parties who are not parties to this Agreement.  This waiver is
     knowingly, willingly and voluntarily made by Debtor and Secured Party,
     and Debtor and Secured Party acknowledges and agrees that this waiver
     of trial by jury is a material aspect of the agreements between Debtor
     and Secured Party and that no representations of fact or opinion have
     been made by any person to induce this waiver of trial by jury or to
     modify, limit or nullify its effect.

               4.3  Additional Waivers.  Except in the case of any
                    ------------------

















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     notices specifically required to be given to Debtor by Secured Party,
     any Lender, Issuing Bank or any Noteholder pursuant to this Agreement,
     any of the Lender Documents or any of the Noteholder Documents, Debtor
     hereby waives notice of each and every one of the following acts,
     events and/or conditions and agrees that, without necessity for any
     express reservation of rights against Debtor, neither the occurrence
     or existence of any such act, event or condition, nor Secured Party's,
     any Lender's, Issuing Bank's or any Noteholder's commission of or
     omission to do any such act, event or condition, in any number of
     instances, shall in any way release, discharge, impair or diminish any
     of the Secured Obligations, except as otherwise specifically agreed by
     Secured Party in writing:  (a) the amendment, modification, renewal,
     extension or refinancing of, or the granting by Secured Party, any
     Lender, Issuing Bank or any Noteholder of any indulgence of any nature
     with respect to, or the invalidity, voidability, unenforceability,
     compromise, settlement, release, waiver, discharge or impairment, in
     whole or in part, of, any of the Secured Obligations or any obligation
     of any Other Obligor with respect to any of the Secured Obligations;
     (b) any defense of Debtor or any Other Obligor to payment of any of
     the Secured Obligations; (c) the addition of any maker, guarantor,
     surety, endorser, indemnitor or other person primarily or secondarily
     liable for or obligated upon any of the Secured Obligations;
     (d) assumption of any of the Secured Obligations by any other person,
     whether by assignment, sale, merger, consolidation, sublease,
     conveyance or otherwise; (e) delivery to Secured Party, any Lender,
     Issuing Bank or any Noteholder or acceptance by Secured Party, any
     Lender, Issuing Bank or any Noteholder of any promissory note or other
     instrument or writing evidencing or otherwise relating to any of the
     Secured Obligations; (f) the institution of any suit, the obtaining of
     any judgment or the exercise of any other right or remedy against
     Debtor or any Other Obligor; (g) the sale, exchange, pledge, release,
     disposition, surrender, loss, destruction, damage to or impairment of,
     any Collateral; (h) the creation, perfection, continuation, amendment,
     modification, invalidity, voidability, unenforceability, compromise,
     settlement, subordination, release, waiver, discharge, impairment or
     loss of priority, in whole or in part, of, any security interest, lien
     other encumbrance directly or indirectly securing any of the
     Obligations; or (i) any other event, circumstance or condition which
     might otherwise constitute a legal or equitable discharge of a
     borrower.  Debtor also hereby waives, to the extent the same may be
     waived under applicable law:  (a) notice of acceptance by Secured
     Party of this Agreement; (b) all claims, causes of action and rights
     of Debtor against Secured Party on account of actions taken or not
     taken by Secured Party in the exercise of Secured Party's rights or
     remedies under this Agreement or under law, provided that the same did
     not arise from Secured Party's negligence or willful misconduct;
     (c) all claims and causes of action of Debtor against Secured Party
     for punitive, exemplary, indirect, special,




















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     consequential or other non-compensatory damages; (d) all rights of
     redemption of Debtor with respect to any of the Collateral; (e) in the
     event Secured Party seeks to repossess any or all of the Collateral by
     judicial proceedings, any bonds or demands for possession which
     otherwise may be required; (f) all rights of Debtor to have marshalled
     the Collateral or any other security for any of the Secured
     Obligations; (g) diligence in the enforcement or collection of all of
     the Obligations; (h) presentment, protest, notice of protest and
     notice of non-payment with respect to all of the Secured Obligations;
     and (i) any duty or obligation of Secured Party to disclose to Debtor
     any information concerning any other customer or client, or
     prospective customer or client, of Secured Party.  Debtor agrees that
     Secured Party may exercise any or all of its rights and/or remedies
     without resorting to, without regard to, and regardless of the
     adequacy of, any security or other sources of liability with respect
     to any of the Secured Obligations.  Neither any failure nor any delay
     on the part of Secured Party in exercising any right, power or remedy
     shall operate as a waiver thereof, nor shall a single or partial
     exercise thereof preclude any other or further exercise thereof or the
     exercise of any other right, power or remedy.

               4.4 Modifications, Notices.  No modification or waiver of
                   ----------------------
     any provision of this Agreement, and no consent by Secured Party to
     any failure of Debtor to comply with any provision of this Agreement,
     shall in any event be effective unless the same shall be in writing
     and signed by the person against whom enforcement thereof is sought,
     and then such waiver or consent shall be effective only in the
     specific instance and for the purpose for which given.  No notice to
     or demand upon Debtor in any circumstance shall entitle Debtor to any
     other or further notice or demand in the same, similar or other
     circumstances.  All notices, requests and demands to or upon the
     respective parties hereto to be effective shall be in writing and
     shall be deemed to have been duly given or made when delivered by
     hand, or, if earlier, three (3) calendar days after being deposited in
     the mail, postage prepaid, or when transmitted by telecopy
     transmission, provided that any such notice or communication to Debtor
     shall be hand-delivered or transmitted to Debtor at the Debtor Notice
     Address (or at such other address as Debtor may specify to Secured
     Party in writing from time to time), and any such notice or
     communication to Secured Party shall be hand-delivered or transmitted
     to Secured Party at the Secured Party Notice Address (or at such other
     address as Secured Party may specify to Debtor in writing from time to
     time).

               4.5 Survival, Merger and Counterparts.  All representations,
                   ---------------------------------
     warranties, covenants, conditions and agreements contained herein
     shall survive the execution and delivery hereof.  Debtor shall
     continue to observe, comply with and perform all warranties,
     covenants, conditions and agreements to be observed,

















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     complied with or performed by Debtor under this Agreement until all of
     the Lender Obligations have been paid in full, there exists no
     commitment by any of Lenders or Issuing Bank which could give rise to
     any Lender Obligations.  This Agreement contains the entire agreement
     of the parties with respect to the matters covered and the
     transactions contemplated hereby and thereby, and no agreement,
     statement or promise made by any party hereto, or by any employee,
     officer, agent or attorney of any party hereto, which is not contained
     herein or therein, shall be valid or binding.  This Agreement may be
     executed in any number of counterparts and by different parties on
     separate counterparts, each of which, when so executed and delivered,
     shall be an original, but all such counterparts shall together
     constitute one and the same agreement.

               4.6 Law, Jurisdiction, Process, Transfers and
                   -----------------------------------------
     Unenforceability.  The performance and construction of this Agreement
     ----------------
     shall be governed by the internal laws of the State of Maryland
     (exclusive of principles of conflicts of laws).  Debtor agrees that
     any suit, action or proceeding with respect to the Collateral or this
     Agreement may be brought in any state or federal court located in the
     State of Maryland.  Debtor consents to the in personam jurisdiction of
                                                -- --------
     such courts and Debtor irrevocably waives any objection to, and any
     right of immunity from, the jurisdiction of such courts or the
     execution of judgments resulting therefrom, on the grounds of venue or
     the convenience of the forum.  In addition, any such suit, action or
     proceeding instituted by Secured Party may be brought in such other
     courts in which jurisdiction and venue may be appropriate.  Debtor
     agrees that service of process in any such suit, action or proceeding
     may be effected by mailing a copy thereof by registered or certified
     mail (or any substantially similar form of mail), postage prepaid, to
     Debtor at the Debtor Notice Address (or at such other address as
     Debtor may specify to Secured Party in writing from time to time). 
     This Agreement shall be binding upon and inure to the benefit of the
     parties hereto and their respective successors and assigns, and each
     reference in this Agreement to any of the parties hereto shall be
     deemed to include the successors and assigns of such party, including,
     in the case of Debtor, the debtor, the debtor in possession and
     trustee in any case under any chapter of the United States Bankruptcy
     Code in which Debtor is debtor.  Debtor may not assign this Agreement
     or any of its rights hereunder without Secured Party's prior written
     consent.  Subject to applicable law and agreements, any of Lenders,
     Issuing Bank or Noteholders may at any time, in its discretion,
     assign, transfer or pledge to any person, or grant to any person a
     security interest in, this Agreement or any of its rights hereunder. 
     Subject to applicable law and agreements, any of Lenders, Issuing Bank
     or Noteholders may sell, in such amounts, upon such terms and to such
     persons as it may determine, participations in its beneficial
     interests under this Agreement.  If any term, provision or condition,
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     Agreement shall for any reason be found or held invalid or
     unenforceable by any court or governmental agency, such invalidity or
     unenforceability shall not affect te remainder of such term, provision
     or condition, nor any other term, provision or condition, and this
     Agreement shall survive and be construed as if such invalid or
     unenforceable term, provision or condition had not been contained
     herein or therein; provided, however, that if any rate of interest
     provided under this Agreement does or shall exceed the maximum
     interest rate which Debtor is permitted by law to contract or agree to
     pay, then such rate of interest shall immediately be deemed to be
     reduced to such maximum rate and all previous payments of interest in
     excess of the maximum rate shall be deemed to have been payments in
     reduction of principal and not of interest.























































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               IN WITNESS WHEREOF, Debtor and Secured Party have duly
     executed this Agreement under seal as of the day and year first
     written above.


     ATTEST/WITNESS:                    FIRST FIDELITY BANK, NATIONAL
                                           ASSOCIATION, as Agent



     _________________________
     By:__________________________(SEAL)
                                           Michael W. Coiley
                                           Vice President


                                        AAI CORPORATION



                                        By:__________________________(SEAL)
     -------------------------
                                           Paul J. Michaud
                                           Vice President









































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<PAGE>




                               SECURITY AGREEMENT


     THIS AGREEMENT is made as of the _______ day of ________________,
     1994, by and among FIRST FIDELITY BANK, NATIONAL ASSOCIATION, as Agent
     (in such capacity, "Secured Party") for the Lenders, the Issuing Bank
     and the Noteholders (as those terms are hereinafter defined), and the
     other corporations which have executed this Agreement (individually
     and collectively, "Debtors").


              SECTION 1.  CONSTRUCTION OF AGREEMENT AND DEFINITIONS


     Unless the context otherwise requires, all of the terms used herein
     without definition which are defined by the Maryland Uniform
     Commercial Code shall have the meanings assigned to them by the
     Maryland Uniform Commercial Code except to the extent varied by this
     Agreement.  Unless the context otherwise requires, all capitalized
     terms hereinbefore or hereinafter used in this Agreement without
     definition shall have the meanings assigned to such terms in the
     Credit Agreement.  The phrases "satisfactory to Secured Party,"
     "acceptable to Secured Party" and similar phrases shall mean
     satisfactory or acceptable to Secured Party, in Secured Party's
     discretion exercised in good faith.  The use of the singular herein
     shall also refer to the plural and vice versa, and the use herein of
     any gender, including the neuter, shall also refer to each of the
     other genders, including the neuter.  The captions and headings
     contained in this Agreement are for convenience of reference only and
     shall not affect the meaning, or the construction or interpretation,
     of this Agreement.  In addition to terms defined elsewhere in this
     Agreement, the following terms shall have the following meanings when
     used herein:

               "BORROWER" shall mean AAI Corporation, a Maryland
     corporation.

               "COLLATERAL" shall mean:  (a) all Receivables, General
     Intangibles, Inventory, Equipment and Computer Hardware and Software,
     each Cash Collateral Account and, in addition, all other property of
     each of Debtors in which Secured Party has, or may in the future
     acquire or be granted, a security interest hereunder; (b) all amounts
     now or in the future owed by any of Secured Party, Lenders, Issuing
     Bank or Noteholders to any of Debtors and all property and funds of
     each of Debtors (including deposit accounts, certificates of deposit,
     and investments made or managed by Secured Party on behalf of any of
     Debtors), now owned or hereafter acquired by each of Debtors and now
     or hereafter in the possession or control of any of Secured Party,
     Lenders, Issuing Bank or Noteholders; (c) all present and future 





















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     substitutions, replacements, appurtenances, accessories, accessions
     and materials and supplies relating to any of the foregoing; (d) all
     present and future books and records of each of Debtors in any form,
     in or on any media, including data processing materials in any form
     (including software, tapes, disks and the like), whether in the
     possession of any of Debtors or any other person; and (e) all present
     and future proceeds and products of all of the foregoing in any form
     whatsoever and all rights, including rights to the payment of money
     for any reason, arising on account of any sale, assignment, lease,
     rental, license, exchange, liquidation, condemnation, taking, theft or
     any disposition of any nature of, or any damage or casualty to, or any
     loss with respect to, any of the foregoing or any rights or interests
     of any of Debtors in any of the foregoing, including, without
     limitation, cash proceeds (including all payments under any
     indemnities, warranties or guaranties payable with respect to any of
     the foregoing), non-cash proceeds and proceeds acquired with cash
     proceeds, whether any such proceeds constitute consumer goods, farm
     products, equipment, inventory, documents of title, chattel paper,
     accounts, instruments or general intangibles, and all proceeds of
     insurance policies insuring any of the foregoing or any risks to any
     of Debtors associated with any of the foregoing.

               "COLLATERAL LOCATIONS" shall mean the locations identified
     on the Collateral Locations Exhibit attached hereto.

               "COMPUTER HARDWARE AND SOFTWARE" shall mean:  (a) all of
     Debtors' computer and other electronic data processing hardware,
     integrated computer systems, central processing units, memory units,
     display terminals, printers, features, computer elements, card
     readers, tape drives, hard and soft disk drives, cables, electrical
     supply hardware, generators, power equalizers, accessories and all
     peripheral devices and other related computer hardware, whether now
     owned, licensed or leased or hereafter acquired by any of Debtors;
     (b) all software programs, including source codes and object codes,
     whether now owned, licensed or leased or hereafter acquired by any of
     Debtors, designed for use or used on the equipment described in the
     preceding clause (a), and all firmware associated therewith, whether
     now owned, licensed or leased or hereafter acquired by any of Debtors;
     and (c) all present and future manuals and other written materials and
     documentation (and packaging thereof or relating thereto) for such
     equipment, software or firmware, whether now owned, licensed or leased
     or hereafter acquired by any of Debtors.

               "COPYRIGHT RIGHTS" shall mean all right, title and interest
     of each of Debtors, whether now owned or existing or hereafter
     acquired or arising, in and to all domestic and foreign copyrights,
     copyright registrations and copyright applications, whether or not
     registered or filed with any Governmental Authority, together with
     (a) all renewals thereof, (b) all



















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     present and future rights of each of Debtors under all present and
     future license agreements relating thereto, whether any of Debtors is
     licensee or licensor thereunder, (c) all income, royalties, damages
     and payments now or hereafter due and/or payable to any of Debtors
     thereunder or with respect thereto, including, without limitation,
     damages and payments for past, present or future infringements
     thereof, (d) all present and future claims of each of Debtors, causes
     of action of each of Debtors and rights of each of Debtors to sue for
     past, present or future infringements thereof, and (e) all rights
     corresponding thereto throughout the world.

               "CREDIT AGREEMENT" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Credit Agreement of even date herewith
     among Borrower, Secured Party, Lenders and Issuing Bank.

               "DEBTOR DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, this Agreement and any additional Noteholder Documents
     executed or assumed by any of Debtors, the Lender Guaranty and any
     additional Lender Documents executed or assumed by any of Debtors.

               "DEBTOR NOTICE ADDRESS" shall mean York Road and Industry
     Lane, Hunt Valley, Maryland 21030.

               "DEBTOR OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, increased,
     refinanced, consolidated or replaced from time to time, all present
     and future obligations, indebtedness and liabilities of each of
     Debtors to each of Lenders, Issuing Bank and Noteholders of every kind
     and nature evidenced by or arising under or in connection with the
     Debtor Documents (including, without limitation, all principal
     amounts, interest charges, fees, commissions and all other charges and
     sums, as well as all costs and expenses, including reasonable
     attorneys' fees and expenses, payable or reimbursable by any of
     Debtors under or pursuant to the Debtor Documents), whether direct or
     indirect, contingent or noncontingent, matured or unmatured, accrued
     or not accrued, liquidated or unliquidated, whether arising in
     contract, tort or otherwise, whether the liability of any of Debtors
     with respect thereto is joint or several or both, and whether or not
     any instrument or agreement relating thereto specifically refers to
     this Agreement, including, without limitation, all claims of Lenders,
     Issuing Bank and Noteholders against each of Debtors arising or re-
     arising on account of or as a result of any payment made by any of
     Debtors or any other person with respect to any obligations included
     in this definition which is rescinded or recovered from or restored or
     returned by any of Lenders, Issuing Bank or Noteholders under
     authority of any law, rule, regulation,




















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     order of court or governmental agency, or in connection with any
     compromise or settlement relating thereto or relating to any pending
     or threatened action, suit or proceeding relating thereto, whether
     arising out of any proceedings under the United States Bankruptcy Code
     or otherwise.

               "EQUIPMENT" shall mean:  (a) all equipment of each of
     Debtors of every type and description, now owned and hereafter
     acquired and wherever located, including, without limitation, all
     machinery, vehicles and other rolling stock, furniture, furnishings,
     tools, dies, leasehold improvements, fixtures, and materials and
     supplies relating to any of the foregoing; (b) all present and future
     documents of title and trust receipts relating to any of the
     foregoing; (c) all present and future rights, claims and causes of
     action of each of Debtors in connection with purchases by any of
     Debtors of (or contracts for the purchase by any of Debtors of), or
     warranties relating to, or damages to, goods held or to be held by any
     of Debtors as equipment; (d) all present and future warranties,
     manuals and other written materials (and packaging thereof or relating
     thereto) relating to any of the foregoing; and (e) all present and
     future rights, claims and causes of action of each of Debtors in
     connection with any agreements pursuant to which any suppliers,
     manufacturers or other persons have agreed or may agree, conditionally
     or otherwise, to purchase or repurchase from any of Debtors, in bulk
     or otherwise, any goods held or to be held by any of Debtors as
     equipment.

               "EVENT OF DEFAULT" shall mean an "Event of Default," as
     defined in the Credit Agreement, or an "Event of Default," as defined
     in the Note Purchase Agreement.

               "EXCLUDED UIC-DEL NOTE" shall mean that certain Promissory
     Note dated February 26, 1985, issued by Smith & Nephew Investment
     Group, Ltd., a Delaware corporation, to UIC - DEL. Corporation in the
     original principal amount of $42,699,384.00 and having a present
     unpaid principal balance of $8,539,876.80.

               "GENERAL INTANGIBLES" shall mean all present and future
     personal property, interests and rights of each of Debtors (including
     things in action), other than goods, accounts, chattel paper,
     documents, instruments and money, but including, without limitation: 
     (a) all Intellectual Property; (b) all uncertificated capital stock
     and other securities, partnership interests, joint venture interests
     and other investments and similar interests of each of Debtors,
     whether now owned or hereafter acquired by any of Debtors, together
     with all present and future rights, titles, interests, powers,
     authorities, options, warrants, privileges and benefits thereof or
     accruing or in any way relating thereto, and all present and future
     claims, rights, titles and interests of each of Debtors in and to all
     present and future payments, receipts, collections, profits,


















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     revenues, dividends, distributions, surplus, income, entitlements,
     exchanges, benefits and other proceeds and avails thereof or in any
     way relating thereto; and (c) all present and future customer lists of
     each of Debtors. 

               "GOOD FAITH" shall mean, with respect to a determination,
     request or other action to be made or taken by Secured Party "in good
     faith," that Secured Party shall make or take such determination,
     request or other action honestly and not maliciously.

               "INTELLECTUAL PROPERTY" shall mean:  (a) all Copyright
     Rights; (b) all Patent Rights; (c) all Trademark Rights; (d) all
     License Rights; (e) all goodwill of each of Debtors; (f) all present
     and future trade secrets of each of Debtors; and (g) all other present
     and future intellectual property of each of Debtors.

               "INTERCREDITOR AGREEMENT" shall mean, as the same may be
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Intercreditor Agreement of even date
     herewith among Secured Party, Lenders, Issuing Bank and Noteholders.

               "INVENTORY" shall mean:  (a) all inventory of each of
     Debtors of every type and description, now owned and hereafter
     acquired and wherever located, including, without limitation, raw
     materials, work in process, finished goods, goods returned or
     repossessed, and goods held for demonstration, marketing or similar
     purposes; (b) all present and future materials and supplies of each of
     Debtors used, usable or consumed in the course of business of each of
     Debtors, whether relating to the manufacture, assembly, installation,
     repair, packaging, packing or shipment of goods by any of Debtors, or
     relating to advertising or any other aspect of any business of any of
     Debtors; (c) all present and future property of each of Debtors in or
     on which any of the foregoing is stored or maintained; (d) all present
     and future warranties, manuals and other written materials (and
     packaging thereof or relating thereto) relating to any of the
     foregoing; (e) all present and future documents of title and trust
     receipts relating to any of the foregoing; (f) all present and future
     customer lists of each of Debtors; (g) all present and future rights
     of each of Debtors in connection with goods consigned to or by any of
     Debtors; (h) all present and future rights of each of Debtors as an
     unpaid seller of goods, including rights of stoppage in transit,
     detinue and reclamation; (i) all present and future rights, claims and
     causes of action of each of Debtors in connection with purchases by
     any of Debtors of (or contracts for the purchase by any of Debtors
     of), or warranties relating to, or damages to, goods held or to be
     held by any of Debtors as inventory; and (j) all present and future
     rights, claims and causes of action of each of Debtors in





















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     connection with any agreements pursuant to which any suppliers,
     manufacturers or other persons have agreed or may agree, conditionally
     or otherwise, to purchase or repurchase from any of Debtors, in bulk
     or otherwise, any goods held or to be held by any of Debtors as
     inventory.

               "ISSUING BANK" shall mean the person from time to time party
     to the Credit Agreement as "Issuing Bank."

               "LENDER DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, the Credit Agreement, the Revolving Credit Notes, the
     Borrower Security Agreement, the Borrower Pledge Agreement, the Deed
     of Trust, the Lender Guaranty, the UIC Pledge Agreement, the UIC
     Subordination Agreement, the UIC-DEL Subordination Agreement, the L/C
     Agreements, this Agreement, and any and all other agreements,
     contracts, promissory notes and other instruments, security
     agreements, assignments, pledge agreements, indemnification
     agreements, mortgages, deeds of trust, leases, guaranties and other
     documents now or hereafter existing and evidencing, securing (directly
     or indirectly), guaranteeing (or in effect guaranteeing) or
     indemnifying (or in effect indemnifying) any of Lenders or Issuing
     Bank with respect to, any of the aforementioned documents or any
     obligations of any person to any of Lenders or Issuing Bank
     thereunder.

               "LENDER GUARANTY" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Guaranty of even date herewith executed and
     delivered by Debtors and UIC in favor of Secured Party, Lenders and
     Issuing Bank.

               "LENDER OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, refinanced,
     consolidated or replaced from time to time, all present and future
     Revolving Credit Loans, L/C Reimbursement Obligations and other
     obligations, indebtedness and liabilities of Borrower to each of
     Lenders and Issuing Bank arising under, evidenced by or in connection
     with the Credit Agreement or the other Lender Documents, including,
     without limitation, all principal amounts, including future advances,
     indemnification obligations, interest charges, fees, premiums,
     commissions and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Borrower under or in connection with the Credit
     Agreement or the other Lender Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing, and including, without limitation, all claims
     against Borrower arising or re-arising on account of or as a result of
     any payment made by

















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     Borrower or any other person with respect to any obligations included
     in this definition which is rescinded or recovered from any of Lenders
     or Issuing Bank or restored or returned by any of Lenders or Issuing
     Bank under authority of any law, rule, regulation, order of court or
     Governmental Authority, or in connection with any compromise or
     settlement relating thereto or relating to any pending or threatened
     action, suit or proceeding relating thereto, whether arising out of
     any proceedings under the United States Bankruptcy Code or otherwise. 


               "LENDERS" shall mean the persons from time to time parties
     to the Credit Agreement as "Lenders."

               "LICENSE RIGHTS" shall mean all present and future licenses
     and license agreements of each of Debtors, and all rights of each of
     Debtors under or in connection therewith, whether any of Debtors is
     licensee or licensor thereunder, including, without limitation, any
     present or future franchise agreements under which any of Debtors is
     franchisee or franchisor, together with (a) all renewals thereof,
     (b) all income, royalties, damages and payments now or hereafter due
     and/or payable to each of Debtors thereunder or with respect thereto,
     including, without limitation, damages and payments for past, present
     or future infringements thereof, (c) all claims, causes of action and
     rights to sue for past, present or future infringements thereof, and
     (d) all rights corresponding thereto throughout the world.

               "NOTE PURCHASE AGREEMENT" shall mean, as the same has been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Note Purchase
     Agreement dated July 15, 1992, among Borrower and Noteholders.

               "NOTEHOLDER DOCUMENTS" shall mean, as the same have been or
     may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, the Note Purchase
     Agreement, the Noteholder Notes, the UIC Noteholder Guaranty and any
     and all other agreements, contracts, promissory notes and other
     instruments, security agreements, assignments, pledge agreements,
     indemnification agreements, mortgages, deeds of trust, leases,
     guaranties and other documents now or hereafter existing and
     evidencing, securing, directly or indirectly, guaranteeing (or in
     effect guaranteeing) or indemnifying (or in effect indemnifying)
     Noteholders with respect to, any of the aforementioned documents or
     any obligations of any person to Noteholders thereunder.

               "NOTEHOLDER NOTES" shall mean, as the same have been or may
     hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain 8.65% Senior
     Note Due July 31, 1999, dated August 11, 1992, issued by




















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     Borrower to TRAL & CO, nominee of The Travelers Insurance Company,
     pursuant to the Note Purchase Agreement in the original principal
     amount of $9,000,000.00, that certain 8.65% Senior Note Due July 31,
     1999, dated August 11, 1992, issued by Borrower to TRAL & CO, nominee
     of The Travelers Indemnity Company of Rhode Island, pursuant to the
     Note Purchase Agreement in the original principal amount of
     $3,000,000.00 and assigned by The Travelers Indemnity Company of Rhode
     Island to The Travelers Insurance Company, that certain 8.65% Senior
     Note Due July 31, 1999, dated August 11, 1992, issued by Borrower to
     Principal Mutual Life Insurance Company pursuant to the Note Purchase
     Agreement in the original principal amount of $10,000,000.00, and that
     certain 8.65% Senior Note Due July 31, 1999, dated August 11, 1992,
     issued by Borrower to Principal Mutual Life Insurance Company pursuant
     to the Note Purchase Agreement in the original principal amount of
     $3,000,000.00.

               "NOTEHOLDER OBLIGATIONS" shall mean, as the same may have
     been or may hereafter be waived, amended, modified, extended, renewed,
     supplemented, refinanced, consolidated or replaced from time to time,
     all present and future obligations, indebtedness and liabilities of
     Borrower to each of Noteholders arising under, evidenced by or in
     connection with the Noteholder Documents, including, without
     limitation, principal amounts (but not including any additional loans
     or advances by Noteholders to Borrower), interest charges, fees,
     premiums and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Borrower to each of Noteholders under or in
     connection with the Noteholder Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing and including, without limitation, all claims
     against Borrower arising or re-arising on account of or as a result of
     any payment made by Borrower or any other person with respect to any
     obligations included in this definition which is rescinded or
     recovered from any of Noteholders or restored or returned by any of
     Noteholders under authority of any law, rule, regulation, order of
     court or Governmental Authority, or in connection with any compromise
     or settlement relating thereto or relating to any pending or
     threatened action, suit or proceeding relating thereto, whether
     arising out of any proceedings under the United States Bankruptcy Code
     or otherwise.  

               "NOTEHOLDERS" shall mean, collectively, Principal Mutual
     Life Insurance Company, an Iowa corporation, and The Travelers
     Insurance Company, a Connecticut corporation.

               "PATENT RIGHTS" shall mean all right, title and interest of
     each of Debtors, whether now owned or existing or hereafter acquired
     or arising, in and to all United States and


















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     foreign patents, and pending and abandoned United States and foreign
     patent applications, including, without limitation, the inventions and
     improvements described or claimed therein, together with (a) any
     reissues, divisions, continuations, certificates of re-examination,
     extensions and continuations-in-part thereof, (b) all present and
     future rights of each of Debtors under all present and future license
     agreements relating thereto, whether any of Debtors is licensee or
     licensor thereunder, (c) all income, royalties, damages and payments
     now or hereafter due and/or payable to each of Debtors thereunder or
     with respect thereto, including, without limitation, damages and
     payments for past, present or future infringements thereof, (d) all
     present and future claims of each of Debtors, causes of action of each
     of Debtors and rights of each of Debtors to sue for past, present or
     future infringements thereof, and (e) all rights corresponding thereto
     throughout the world.

               "PERSON" shall mean any individual, corporation, limited
     liability company, partnership, joint venture, association, trust,
     business trust, Governmental Authority (or subdivision, agency or
     department thereof) or other entity of any kind.

               "RECEIVABLES" shall mean:  (a) all present and future
     accounts, contract rights, receivables, chattel paper, documents and
     promissory notes and other negotiable and non-negotiable instruments
     of each of Debtors, not including the Excluded UIC-DEL Note but
     including, without limitation, that certain Mortgage Note dated
     June 1, 1994, executed and delivered in favor of AAI Microflite
     Simulation International Corporation by JMI, a New York partnership,
     and Broome County Industrial Development Agency in the original
     principal amount of One Million Two Hundred Thousand Dollars
     ($1,200,000.00), and all certificated securities and other
     certificates evidencing capital stock of any person or any other
     ownership, equity or other rights in any person or property, together
     with all present and future rights, titles, interests, powers,
     authorities, options, warrants, privileges and benefits thereof or
     accruing or in any way relating thereto, and all present and future
     claims, rights, titles and interests of each of Debtors in and to all
     present and future payments, receipts, collections, profits, revenues,
     dividends, distributions, surplus, income, entitlements, exchanges,
     benefits and other avails thereof or in any way relating thereto;
     (b) all present and future tax refunds of each of Debtors and all
     present and future rights of each of Debtors to refunds or returns of
     prepaid expenses, including unearned insurance premiums; (c) all
     present and future cash of each of Debtors; (d) all present and future
     proceeds of Revolving Credit Loans; (e) all deposit accounts now or
     hereafter maintained or established by, for or on behalf of each of
     Debtors with any bank or other institution, and all balances of funds
     now or hereafter on deposit in all such accounts, including, without
     limitation, all checking accounts,



















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     collection accounts, lockbox accounts, disbursement accounts,
     concentration accounts and all other deposit accounts of every kind
     and nature; (f) all present and future judgments, orders, awards and
     decrees in favor of any of Debtors and causes of action in favor of
     any of Debtors; (g) all present and future claims, rights of
     indemnification and other rights of each of Debtors under or in
     connection with any contracts or agreements to which any of Debtors is
     or becomes a party or third party beneficiary; (h) all rights and
     claims of each of Debtors with respect to any deposits of money or
     other property made with any lessors of any property, insurers,
     bonding agents or any other persons; (i) all present and future rights
     and claims which any of Debtors may now or hereafter have under any
     insurance policies, contracts or coverages now or hereafter in effect;
     (j) all goods previously or hereafter returned, repossessed or stopped
     in transit, the sale, lease or other disposition of which contributed
     to the creation of any account, instrument or chattel paper of any of
     Debtors; (k) all present and future rights of each of Debtors as an
     unpaid seller of goods, including rights of stoppage in transit,
     detinue and reclamation; (l) all rights which any of Debtors may now
     or at any time hereafter have, by law or agreement, against any
     account debtor or other obligor of any of Debtors, and all rights,
     liens and security interests which any of Debtors may now or at any
     time hereafter have, by law or agreement, against any property of any
     account debtor or other obligor of any of Debtors; (m) all present and
     future interests and rights of any of Debtors, including rights to the
     payment of money, under or in connection with all present and future
     leases and subleases of real or personal property to which any of
     Debtors is a party, as lessor, sublessor, lessee or sublessee; and
     (n) all present and future contingent and noncontingent rights of each
     of Debtors to the payment of money for any reason whatsoever, whether
     arising in contract, tort or otherwise, whether or not such rights are
     otherwise included in this definition.

               "SECURED OBLIGATIONS" shall mean, collectively, the Lender
     Obligations, the Noteholder Obligations and the Debtor Obligations.

               "SECURED PARTY NOTICE ADDRESS" shall mean 123 South Broad
     Street, Philadelphia, Pennsylvania 19109.

               "TRADEMARK RIGHTS" shall mean all right, title and interest
     of each of Debtors, whether now owned or existing or hereafter
     acquired or arising, in and to all domestic and foreign servicemarks,
     servicemark registrations, servicemark applications, trademarks,
     trademark registrations, trademark applications and trade names,
     whether or not registered or filed with any Governmental Authority,
     together with (a) all renewals thereof, (b) all present and future
     rights of each of Debtors under all present and future license
     agreements relating thereto,




















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     whether any of Debtors is licensee or licensor thereunder, (c) all
     income, royalties, damages and payments now or hereafter due and/or
     payable to each of Debtors thereunder or with respect thereto,
     including, without limitation, damages and payments for past, present
     or future infringements thereof, (d) all present and future claims of
     each of Debtors, causes of action of each of Debtors and rights of
     each of Debtors to sue for past, present or future infringements
     thereof, and (e) all rights corresponding thereto throughout the
     world.

               "UIC NOTEHOLDER GUARANTY" shall mean, as the same may have
     been or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Guaranty
     Agreement dated July 15, 1992, executed and delivered by UIC in favor
     of Noteholders.


                  SECTION 2.  SECURITY INTEREST AND COLLATERAL


     2.1Grant of Security Interest.  As security for the Secured
        --------------------------
     Obligations, each of Debtors hereby grants to Secured Party, for the
     ratable benefit of Lenders, Issuing Bank and Noteholders according to
     the provisions of this Agreement and the Intercreditor Agreement, a
     lien and continuing security interest in, and pledges and assigns to
     Secured Party, for the ratable benefit of Lenders, Issuing Bank and
     Noteholders according to the provisions of this Agreement and the
     Intercreditor Agreement, the Collateral.  Even if any of the Secured
     Obligations shall at any time or from time to time be paid in full,
     Secured Party's security interest shall continuously exist until all
     of the Lender Obligations and all of the Debtor Obligations to each
     Lender and Issuing Bank have been paid in full and there exists no
     commitment by any of Lenders or Issuing Bank which could give rise to
     any Lender Obligations.

               2.2 Notices, Additional Documents.  Each of Debtors agrees
                   -----------------------------
     to execute and deliver to Secured Party, or cause to be executed and
     delivered to Secured Party, from time to time promptly after request
     by Secured Party and in form and content satisfactory to Secured
     Party, such security agreements, financing statements, amendments of
     financing statements, assignments of financing statements, security
     interest filing statements, mortgages, deeds of trust, assignments,
     notices, consents and other documents as Secured Party may request in
     good faith in order to confirm, supplement, preserve, protect or
     perfect, or to maintain the perfection of, Secured Party's security
     interest in the Collateral and Secured Party's rights under this
     Agreement.  If any Intellectual Property, or any interest therein,
     shall, to the knowledge of any of Debtors, become the subject of any
     application, registration or other filing with any Governmental
     Authority, each of such Debtors
















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     agrees to notify Secured Party thereof within fifteen (15) Business
     Days after any such filing.  If any Receivable, to the knowledge of
     any of Debtors, arises out of a contract with the United States of
     America or any state, county, municipality or other Governmental
     Authority, or any department or agency thereof, each of such Debtors
     agrees to notify Secured Party thereof within ten (10) Business Days
     after execution of such contract and each of Debtors, if requested by
     Secured Party, agrees to execute and deliver to Secured Party, or
     cause to be executed and delivered to Secured Party, from time to time
     promptly after request by Secured Party and in form and content
     satisfactory to Secured Party, such agreements, notices, consents,
     assignments, acknowledgments and other documents as Secured Party may
     request in good faith, and to do such other things as Secured Party
     may request in good faith, in order that all sums due and to become
     due to Debtors under or in connection with such contract shall be duly
     assigned and paid to Secured Party in accordance with the Federal
     Assignment of Claims Act an/or any other laws, rules and regulations
     relating to the assignment or payment of such contract and sums.

               2.3 Additional Warranties, Agreements Concerning Collateral.
                   -------------------------------------------------------
     Each of Debtors warrants and agrees that:  (a) no financing statement,
     mortgage, deed of trust, assignment, notice of lien or other security
     document publicizing a security interest in or lien upon any of the
     Collateral is or will be on file in any recording or filing office,
     except for financing statements or other security documents
     publicizing Permitted Liens (other than liens for taxes) or security
     interests or other liens with respect to which effective and
     recordable termination statements or other releases have been
     delivered to Secured Party, and the Collateral is and shall remain
     free and clear of all Liens except for Permitted Liens; (b) no
     Intellectual Property of any of Debtors is the subject of any
     application, registration or other filing with any Governmental
     Authority (other than foreign Governmental Authorities), including the
     United States Patent and Trademark Office and the United States
     Copyright Office, except as set forth on the Intellectual Property
     Exhibit attached hereto; (c) each of Debtors will not, without Secured
     Party's prior written consent, sell, assign, transfer, convey or
     lease, or suffer or permit to occur any sale, assignment, transfer,
     conveyance or lease of, any of the Collateral, or any interest
     therein, except for transactions in the ordinary course of business
     and except for transactions expressly permitted by the Credit
     Agreement; (d) except as otherwise heretofore disclosed to Secured
     Party in writing and except for (i) vehicles of Debtors,
     (ii) Collateral in transit to Debtors or to job sites of Debtors,
     (iii) Collateral at job sites of Debtors, and (iv) mobile goods of a
     type normally used in more than one jurisdiction, all of the tangible
     Collateral not in Secured Party's possession is located at the
     Collateral Locations and, unless Secured Party shall consent otherwise
     in writing,


















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     shall remain located at the Collateral Locations; (e) in the case of
     any item of Equipment or Inventory having a fair market value of Five
     Hundred Thousand Dollars ($500,000.00) or more which is located at any
     location or locations other than the Collateral Locations for a period
     of four (4) months or more, keep Secured Party informed at all times
     of the location of such Equipment or Inventory; (f) each of Debtors
     will not, without Secured Party's prior written consent, store or
     place any Collateral with any warehouseman, artisan, processor,
     contractor or bailee, except in the ordinary course of business of
     Debtors as now being conducted; (g) each of Debtors will use prudent
     business judgment in extending credit to account debtors and other
     customers of Debtors; (h) each of Debtors will not permit, consent to
     or agree to, without Secured Party's prior written consent, any
     material extension, modification or compromise of any kind with
     respect to any Receivable, other than in the ordinary course of
     business of Debtors; (i) whenever requested by Secured Party and
     periodically if Secured Party shall so request, each of Debtors will
     promptly deliver to Secured Party, with such indorsements and/or
     assignments as Secured Party may from time to time request in good
     faith, all promissory notes and other instruments, certificates,
     chattel paper, guaranties and documents of title, as well as other
     documents requested by Secured Party, previously or hereafter coming
     into the possession or control of such Debtor and constituting,
     evidencing, securing, guaranteeing or otherwise relating to, any of
     the Collateral or proceeds of any of the Collateral; (j) no check,
     draft, money order or other item of payment made or applied on account
     of any of the Obligations shall constitute a final payment to Secured
     Party unless and until the item of payment shall be honored and
     finally paid to Secured Party in immediately available funds; and
     (k) a carbon, photographic or other reproduction of this Agreement or
     any financing statement signed by any of Debtors in connection with
     this Agreement shall be sufficient as a financing statement.

               2.4 Collateral Collections.  Secured Party shall have the
                   ----------------------
     right at any time and from time to time, at its option:  (a) to
     require any or all of Debtors to deposit in a designated Cash
     Collateral Account, not later than the second Business Day following
     the day on which the same are received, all cash, checks, drafts,
     money orders and other items of payment constituting Collateral, or
     collections or other proceeds of Collateral; and/or (b) to notify,
     and/or to require any or all of Debtors to notify, any or all account
     debtors and other obligors of any or all of Debtors in connection with
     any or all accounts, promissory notes or other instruments,
     guaranties, chattel paper, security agreements, contract rights, tax
     refunds or other Receivables or General Intangibles of any of Debtors,
     or in connection with any or all other obligations, indebtedness or
     liabilities payable to any of Debtors, to make payments thereon
     directly to Secured Party or in care of a post office lockbox which
     shall be maintained by Secured Party, subject to Secured


















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     Party's customary arrangements and charges therefor as established by
     Secured Party from time to time and which shall be under the exclusive
     control of Secured Party, which payments shall be deposited by Secured
     Party in a Cash Collateral Account.  Subject to applicable agreements
     and law, Secured Party shall have the right to apply funds on deposit
     in any Cash Collateral Account from time to time to such of the
     Secured Obligations, whether matured or unmatured, as Secured Party
     may determine in its discretion.  Secured Party shall have the right
     to indorse the name or names of any or all of Debtors on any
     promissory notes or other instruments, acceptances, checks, drafts,
     money orders or other items of payment constituting Collateral, or
     collections or other proceeds of Collateral, that may come into
     Secured Party's possession or control from time to time.  Secured
     Party shall also have the right to send, or to require any or all of
     Debtors to send, to account debtors and other obligors of any or all
     of Debtors from time to time requests for verification of accounts and
     other amounts which may be due to any or all of Debtors.

               2.5 Insurance Proceeds.  Each of Debtors hereby assigns to
                   ------------------
     Secured Party all proceeds of all insurance policies and coverages
     insuring any of the Collateral or any risks associated with any of the
     Collateral.  After the occurrence and during the continuance of a
     Default or an Event of Default, each of Debtors authorizes and directs
     each insurance company to pay all such proceeds directly and solely to
     Secured Party and not to any of Debtors and Secured Party jointly, and
     authorizes and empowers Secured Party to adjust or compromise any loss
     under such policies, to collect and receive all such proceeds, and,
     for those purposes, to execute and indorse in the name of any or all
     Debtors all proofs of loss, drafts, checks and any other documents or
     instruments, and any persons making payments to Secured Party under
     the terms of this provision are hereby relieved absolutely from any
     obligation or responsibility to see to the application of any sums so
     paid, which sums, after deduction of all costs and expenses (including
     reasonable attorneys' fees) paid or incurred by Secured Party in the
     collection and handling thereof, may be applied, at Secured Party's
     option but subject to applicable law and agreements, either toward
     replacing or restoring the Collateral, in a manner and on terms
     satisfactory to Secured Party, or as a credit against such of the
     Secured Obligations, whether matured or unmatured, as Secured Party
     shall determine in its discretion.  Except when a Default or an Event
     of Default shall have occurred and be continuing, Debtors shall have
     the right to collect the proceeds of any such policies, provided that
     all such proceeds collected by Debtors are either applied promptly by
     Debtors to repairing, replacing or restoring the Collateral, in a
     manner and on terms satisfactory to Secured Party, or paid promptly by
     Debtors to Secured Party for application against such of the
     Obligations, whether matured or unmatured, as Secured Party shall




















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     determine in its discretion but subject to applicable law and
     agreements.


































































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                               SECTION 3.  DEFAULT


     3.1Remedies.  Upon and at any time after the occurrence and during the
        --------
     continuance of any Event of Default, Secured Party may, without notice
     or demand, exercise in any jurisdiction in which enforcement hereof is
     sought, the following rights and remedies, in addition to all other
     rights and remedies available to Secured Party, Lenders, Issuing Bank
     and Noteholders under the Lender Documents and the Noteholder
     Documents, the rights and remedies of a secured party under the
     Uniform Commercial Code and all other rights and remedies available to
     Secured Party under law, all such rights and remedies being cumulative
     and enforceable alternatively, successively or concurrently:  (a) take
     exclusive possession of any or all of the Collateral from time to time
     and/or place a custodian in exclusive possession of any or all of the
     Collateral from time to time and, so far as any of Debtors may give
     authority therefor, enter upon any premises on which any of the
     Collateral may be situated and remove the same therefrom, each of
     Debtors hereby waiving any and all rights to prior notice and to
     judicial hearing with respect to repossession of Collateral, and/or
     require any of Debtors, at Debtors' expense, to assemble and deliver
     any or all of the Collateral to such place or places as Secured Party
     may reasonably request; (b) enforce the liens and security interests
     granted to Secured Party hereunder by collecting or liquidating all or
     any part of the Collateral or selling, assigning, leasing, renting,
     licensing or otherwise disposing of all or any part of the Collateral
     or any interest therein, in one or more parcels, at the same or
     different times, at public or private sale or disposition, or
     otherwise; (c) demand, compromise, collect, sue for and receive any
     money or property at any time due, payable or receivable on account of
     any or all accounts, promissory notes or other instruments,
     guaranties, chattel paper, security agreements, contract rights, tax
     refunds or other Receivables or General Intangibles of any or all of
     Debtors, or on account of any or all other debts, liabilities or
     obligations payable to any or all of Debtors; (d) institute any
     proceeding or proceedings to enforce any security interests, liens or
     other rights or interests of Secured Party hereunder; (e) sign the
     name of any or all of Debtors on any invoices to, drafts against and
     other notices and documents to account debtors or other obligors of
     any or all of Debtors and requests for verification of accounts and
     other amounts which may be due to any or all of Debtors; (f) execute
     proofs of claim and loss on behalf of any or all of Debtors;
     (g) subject to applicable law and agreements, apply all Collateral and
     proceeds of Collateral delivered to Secured Party or coming into
     Secured Party's possession or control from time to time to such of the
     Secured Obligations, whether matured or unmatured, as Secured Party
     may determine in its discretion, or hold the same as security for any
     contingent or future Secured Obligations; (h) at Debtors' expense,
     continue or complete, or


















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     cause to be continued or completed, performance of obligations of any
     or all of Debtors under any contracts of any or all of Debtors, and
     collect all income and revenues therefrom; and/or (i) use, operate,
     manage, control and exercise all rights of any or all of Debtors
     relating to, the Collateral and any other assets of any or all of
     Debtors, and collect all income and revenues therefrom.

               3.2 Collateral Dispositions.  Each of Debtors agrees that
                   -----------------------
     commercial reasonableness and good faith require Secured Party to give
     Debtors no more than ten (10) days prior written notice of the time
     and place of any public disposition of Collateral or of the time after
     which any private disposition or any other intended disposition is to
     be made.  All sales or other dispositions of Collateral may be made
     for cash, upon credit or for future delivery.  In no event shall any
     of Debtors be credited with any part of the proceeds of liquidation,
     sale or other disposition of any Collateral until final payment
     thereon has been received by Secured Party in immediately available
     funds, and Secured Party shall have no obligation to delay any
     liquidation, sale or other disposition because the same may result in
     the imposition of any forfeiture, premium or penalty.

               3.3 Expenses.  Each of Debtors jointly and severally agrees
                   --------
     to pay to Secured Party, each Lender, each Noteholder and Issuing Bank
     upon its demand from time to time, the amount of all expenses,
     including reasonable attorneys' fees and expenses, paid or incurred by
     it (a) in exercising or enforcing or consulting with counsel
     concerning, any of its rights hereunder or under law, or (b) in
     defending any and all non-meritorious or previously waived demands,
     claims, counterclaims, cross-claims, causes of action, litigation and
     proceedings of every kind and nature asserted, commenced or instituted
     against it or any of its officers, directors, employees or agents, by
     any one or more of Debtors, any Subsidiary of any one or more of
     Debtors or any Other Obligor on account of, as a result of or relating
     to, any action taken or not taken by Secured Party, any Lender, any
     Noteholder or Issuing Bank in connection with the Collateral or
     enforcement or exercise by it of any of its rights or remedies under
     this Agreement or under law.  Each of Debtors also jointly and
     severally agrees to pay to Secured Party, each Lender, each Noteholder
     and Issuing Bank upon its demand from time to time, interest on the
     outstanding amount of such expenses, from the date of demand for
     payment of such expenses until the same are paid in full, at the rate
     from time to time applicable to Base Rate Loans.
























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                        SECTION 4.  ADDITIONAL PROVISIONS


     4.1Further Assurances, Power of Attorney.  Each of Debtors agrees
        -------------------------------------
     promptly to do, make, execute and deliver all such additional and
     further acts, things, deeds, assurances, instruments and documents as
     Secured Party may request in good faith to vest in and assure to
     Secured Party its rights hereunder or in any of the Collateral.  Each
     of Debtors hereby appoints Secured Party and its designees as
     attorney-in-fact of such Debtor, irrevocably and with power of
     substitution, with authority to execute and deliver from time to time,
     in the name and stead of such Debtor, all documents which such Debtor
     is required to, but has failed or refused to, execute and deliver to
     Secured Party pursuant to this Agreement, and with authority to take
     all of the actions from time to time on behalf of such Debtor, and in
     the name and stead of such Debtor, which Secured Party is authorized
     to take under this Agreement or which Secured Party in its discretion
     exercised in good faith deems necessary or advisable in order to cause
     such Debtor to be in compliance with any of the terms of this
     Agreement or in order to carry out and enforce this Agreement.  Said
     attorney or designee shall not be liable for any acts of commission or
     omission nor for any error of judgment or mistake of fact or law which
     does not arise from its gross negligence or willful misconduct.  This
     power of attorney is coupled with an interest and is irrevocable so
     long as any of the Secured Obligations remain unpaid or unperformed or
     there exists any commitment by Lenders or Noteholders which could give
     rise to any Secured Obligations.

               4.2 Waiver of Trial by Jury.  Each of Debtors and Secured
                   -----------------------
     Party agrees that any action, suit or proceeding involving any claim,
     counterclaim or cross-claim arising out of or in any way relating,
     directly or indirectly, to this Agreement, or any liabilities, rights
     or interests of any of Debtors, Secured Party or any other person
     arising out of or in any way relating, directly or indirectly, to this
     Agreement, shall be tried by a court and not by a jury.  Each of
     Debtors and Secured Party hereby waives any right to trial by jury in
     any such action, suit or proceeding, with the understanding and
     agreement that this waiver constitutes a waiver of trial by jury of
     all claims, counterclaims and cross-claims against all parties to such
     actions, suits or proceedings, including claims, counterclaims and
     cross-claims against parties who are not parties to this Agreement. 
     This waiver is knowingly, willingly and voluntarily made by each of
     Debtors and Secured Party, and each of Debtors and Secured Party
     acknowledges and agrees that this waiver of trial by jury is a
     material aspect of the agreements between such Debtors and Secured
     Party and that no representations of fact or opinion have been made by
     any person to induce this waiver of trial by jury or to modify, limit
     or nullify its effect.


















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               4.3  Additional Waivers.  Except in the case of any notices
                    ------------------
     specifically required to be given to Debtors by Secured Party, any
     Lender, Issuing Bank or any Noteholder pursuant to this Agreement, any
     of the Lender Documents or any of the Noteholder Documents, each of
     Debtors hereby waives notice of each and every one of the following
     acts, events and/or conditions and agrees that, without necessity for
     any express reservation of rights against such Debtors, neither the
     occurrence or existence of any such act, event or condition, nor
     Secured Party's, any Lender's, Issuing Bank's or any Noteholder's
     commission of or omission to do any such act, event or condition, in
     any number of instances, shall in any way release, discharge, impair
     or diminish any of the Secured Obligations, except as otherwise
     specifically agreed by Secured Party in writing:  (a) the amendment,
     modification, renewal, extension or refinancing of, or the granting by
     Secured Party, any Lender, Issuing Bank or any Noteholder of any
     indulgence of any nature with respect to, or the invalidity,
     voidability, unenforceability, compromise, settlement, release,
     waiver, discharge or impairment, in whole or in part, of, any of the
     Secured Obligations or any obligation of any Other Obligor with
     respect to any of the Secured Obligations; (b) any defense of Borrower
     or any Other Obligor to payment of any of the Secured Obligations;
     (c) the addition of any maker, guarantor, surety, endorser, indemnitor
     or other person primarily or secondarily liable for or obligated upon
     any of the Secured Obligations; (d) assumption of any of the Secured
     Obligations by any other person, whether by assignment, sale, merger,
     consolidation, sublease, conveyance or otherwise; (e) delivery to
     Secured Party, any Lender, Issuing Bank or any Noteholder or
     acceptance by Secured Party, any Lender, Issuing Bank or any
     Noteholder of any promissory note or other instrument or writing
     evidencing or otherwise relating to any of the Secured Obligations;
     (f) the institution of any suit, the obtaining of any judgment or the
     exercise of any other right or remedy against any of Debtors,
     Borrower, UIC or any Other Obligor; (g) the sale, exchange, pledge,
     release, disposition, surrender, loss, destruction, damage to or
     impairment of, any Collateral; (h) the creation, perfection,
     continuation, amendment, modification, invalidity, voidability,
     unenforceability, compromise, settlement, subordination, release,
     waiver, discharge, impairment or loss of priority, in whole or in
     part, of, any security interest, lien other encumbrance directly or
     indirectly securing any of the Obligations; or (i) any other event,
     circumstance or condition which might otherwise constitute a legal or
     equitable discharge of a surety or a guarantor.  Each of Debtors also
     hereby waives, to the extent the same may be waived under applicable
     law:  (a) notice of acceptance by Secured Party of this Agreement;
     (b) all claims, causes of action and rights of each of Debtors against
     Secured Party on account of actions taken or not taken by Secured
     Party in the exercise of Secured Party's rights or remedies under this
     Agreement or under law, provided that the



















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     same did not arise from Secured Party's negligence or willful
     misconduct; (c) all claims and causes of action of each of Debtors
     against Secured Party for punitive, exemplary, indirect, special,
     consequential or other non-compensatory damages; (d) all rights of
     redemption of each of Debtors with respect to any of the Collateral;
     (e) in the event Secured Party seeks to repossess any or all of the
     Collateral by judicial proceedings, any bonds or demands for
     possession which otherwise may be required; (f) all rights of each of
     Debtors to have marshalled the Collateral or any other security for
     any of the Secured Obligations; (g) diligence in the enforcement or
     collection of all of the Obligations; (h) presentment, protest, notice
     of protest and notice of non-payment with respect to all of the
     Secured Obligations; and (i) any duty or obligation of Secured Party
     to disclose to any of Debtors any information concerning any other
     customer or client, or prospective customer or client, of Secured
     Party.  Each of Debtors agrees that Secured Party may exercise any or
     all of its rights and/or remedies without resorting to, without regard
     to, and regardless of the adequacy of, any security or other sources
     of liability with respect to any of the Secured Obligations.  Neither
     any failure nor any delay on the part of Secured Party in exercising
     any right, power or remedy shall operate as a waiver thereof, nor
     shall a single or partial exercise thereof preclude any other or
     further exercise thereof or the exercise of any other right, power or
     remedy.

               4.4 Modifications, Notices.  No modification or waiver of
                   ----------------------
     any provision of this Agreement, and no consent by Secured Party to
     any failure of any of Debtors to comply with any provision of this
     Agreement, shall in any event be effective unless the same shall be in
     writing and signed by the person against whom enforcement thereof is
     sought, and then such waiver or consent shall be effective only in the
     specific instance and for the purpose for which given.  No notice to
     or demand upon any of Debtors in any circumstance shall entitle any of
     Debtors to any other or further notice or demand in the same, similar
     or other circumstances.  All notices, requests and demands to or upon
     the respective parties hereto to be effective shall be in writing and
     shall be deemed to have been duly given or made when delivered by
     hand, or, if earlier, three (3) days after being deposited in the
     mail, postage prepaid, or when transmitted by telecopy transmission,
     provided that any such notice or communication to any of Debtors shall
     be hand-delivered or transmitted to such Debtor or Debtors at the
     Debtor Notice Address (or at such other address as such Debtor or
     Debtors may specify to Secured Party in writing from time to time),
     and any such notice or communication to Secured Party shall be hand-
     delivered or transmitted to Secured Party at the Secured Party Notice
     Address (or at such other address as Secured Party may specify to
     Debtors in writing from time to time).




















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               4.5 Survival, Merger and Counterparts.  All representations,
                   ---------------------------------
     warranties, covenants, conditions and agreements contained herein
     shall survive the execution and delivery hereof.  Each of Debtors
     shall continue to observe, comply with and perform all warranties,
     covenants, conditions and agreements to be observed, complied with or
     performed by such Debtor under this Agreement until all of the Lender
     Obligations and all of the Debtor Obligations to each Lender and
     Issuing Bank have been paid in full and there exists no commitment by
     any of Lenders or Issuing Bank which could give rise to any Lender
     Obligations.  This Agreement contains the entire agreement of the
     parties with respect to the matters covered and the transactions
     contemplated hereby and thereby, and no agreement, statement or
     promise made by any party hereto, or by any employee, officer, agent
     or attorney of any party hereto, which is not contained herein or
     therein, shall be valid or binding.  This Agreement may be executed in
     any number of counterparts and by different parties on separate
     counterparts, each of which, when so executed and delivered, shall be
     an original, but all such counterparts shall together constitute one
     and the same agreement.

               4.6 Law, Jurisdiction, Process, Transfers and
                   -----------------------------------------
     Unenforceability.  The performance and construction of this Agreement
     ----------------
     shall be governed by the internal laws of the State of Maryland
     (exclusive of principles of conflicts of laws).  Each of Debtors
     agrees that any suit, action or proceeding with respect to the
     Collateral or this Agreement may be brought in any state or federal
     court located in the State of Maryland.  Each of Debtors consents to
     the in personam jurisdiction of such courts and each of Debtors
         -- --------
     irrevocably waives any objection to, and any right of immunity from,
     the jurisdiction of such courts or the execution of judgments
     resulting therefrom, on the grounds of venue or the convenience of the
     forum.  In addition, any such suit, action or proceeding instituted by
     Secured Party may be brought in such other courts in which
     jurisdiction and venue may be appropriate.  Each of Debtors agrees
     that service of process in any such suit, action or proceeding may be
     effected by mailing a copy thereof by registered or certified mail (or
     any substantially similar form of mail), postage prepaid, to such
     Debtor at the Debtor Notice Address (or at such other address as such
     Debtor may specify to Secured Party in writing from time to time). 
     This Agreement shall be binding upon and inure to the benefit of the
     parties hereto and their respective successors and assigns, and each
     reference in this Agreement to any of the parties hereto shall be
     deemed to include the successors and assigns of such party, including,
     in the case of each of Debtors, the debtor, the debtor in possession
     and trustee in any case under any chapter of the United States
     Bankruptcy Code in which such Debtor is debtor.  None of Debtors may
     assign this Agreement or any of its rights hereunder without Secured
     Party's prior written consent.  Subject to applicable law and
     agreements, any of Lenders, Issuing Bank or Noteholders may at any
     time, in its














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     discretion, assign, transfer or pledge to any person, or grant to any
     person a security interest in, this Agreement or any of its rights
     hereunder.  Subject to applicable law and agreements, any of Lenders,
     Issuing Bank or Noteholders may sell, in such amounts, upon such terms
     and to such persons as it may determine, participations in its
     beneficial interests under this Agreement.  If any term, provision or
     condition, or any part thereof, of this Agreement shall for any reason
     be found or held invalid or unenforceable by any court or governmental
     agency, such inalidity or unenforceability shall not affect the
     remainder of such term, provision or condition, nor any other term,
     provision or condition, and this Agreement shall survive and be
     construed as if such invalid or unenforceable term, provision or
     condition had not been contained herein or therein; provided, however,
     that if any rate of interest provided under this Agreement does or
     shall exceed the maximum interest rate which any of Debtors is
     permitted by law to contract or agree to pay, then such rate of
     interest shall immediately be deemed to be reduced to such maximum
     rate and all previous payments of interest in excess of the maximum
     rate shall be deemed to have been payments in reduction of principal
     and not of interest.

               IN WITNESS WHEREOF, Debtors and Secured Party have duly
     executed this Agreement under seal as of the day and year first
     written above.

     ATTEST/WITNESS:                    FIRST FIDELITY BANK, NATIONAL
                                           ASSOCIATION



     _________________________
     By:__________________________(SEAL)
                                           Michael W. Coiley
                                           Vice President


     [SIGNATURES CONTINUED]
     [SIGNATURES CONTINUED]


                                        AAI SYSTEMS MANAGEMENT, INC.
                                        AAI/ACL TECHNOLOGIES, INC.
                                        AAI ENGINEERING SUPPORT INC.
                                        AAI CALIFORNIA CARSHELL, INC.
                                        AAI MEDICAL CORPORATION





                                        By:__________________________(SEAL)
     -------------------------

                                           Paul J. Michaud














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                                           Vice President of each of the
                                           foregoing Debtors

                                             UIC - DEL. CORPORATION
                                             AAI INTERNATIONAL, INC.
                                             AAI MICROFLITE SIMULATION
                                                INTERNATIONAL CORPORATION
                                             SETI, INC.






     ------------------------------
     By:__________________________(SEAL)
                                           Paul J. Michaud
                                           President of each of the
                                           foregoing Debtors


                                        SYMTRON SYSTEMS, INC.





                                        By:__________________________(SEAL)
     -------------------------
                                           Bernard Fein
                                           Chief Executive Officer



































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				GUARANTY


THIS GUARANTY is made as of the 13th day of October, 1994, by the
undersigned (collectively, "Guarantors") pursuant to that certain
Credit Agreement of even date herewith (as the same may have been
or may hereafter be amended, modified, extended, renewed,
supplemented or replaced from time to time, the "Credit Agree-
ment"), among AAI CORPORATION, a Maryland corporation ("Borrow-
er"), FIRST FIDELITY BANK, NATIONAL ASSOCIATION, as Agent
("Agent"), the Lenders parties thereto and the Issuing Bank party
thereto, which shall be fair and sufficient consideration for the
execution of this Guaranty.

1.Construction and Definitions.  The use herein of the singular
shall also refer to the plural and vice versa, and the use herein
of any gender, including the neuter, shall also refer to each of
the other genders, including the neuter.  All capitalized terms
used in this Guaranty without definition shall have the meanings
assigned to them in the Credit Agreement.  The captions and head-
ings contained in this Guaranty are for convenience of reference
only and shall not affect the meaning, or the construction or
interpretation, of this Guaranty.  The phrases "satisfactory to
Agent," "acceptable to Agent" and similar phrases shall mean
satisfactory or acceptable to Agent, in Agent's discretion exer-
cised in good faith.  In addition to terms defined elsewhere in
this Guaranty, the following terms shall have the following mean-
ings when used herein:

              "Agent Notice Address" shall mean 123 South Broad
Street, Philadelphia, Pennsylvania 19109.

              "good faith" shall mean, with respect to a determi-
nation, request or other action to be made or taken "in good
faith," that such determination, request or other action shall be
made or taken honestly and not maliciously.

              "Guarantor Address" shall mean York Road and Indus-
try Lane, Hunt Valley, Maryland 21030.

              "Issuing Bank" shall mean the person from time to
time party to the Credit Agreement as "Issuing Bank."

              "Lenders" shall mean the persons from time to time
parties to the Credit Agreement as "Lenders."

              "Obligations" shall mean, as the same may be
waived, amended, modified, extended, renewed, supplemented, in-
creased, refinanced, consolidated or replaced from time to time,
all present and future Revolving Credit Loans, L/C Reimbursement
Obligations and all other Indebtedness and obligations of Borrow-
er to Agent, each Lender and Issuing Bank of every kind and na-
ture arising under or in connection with the Credit Agreement or
the other Credit Documents (including, without limitation, all
principal amounts, including future advances, interest charges,
fees, commissions, indemnification obligations (including obliga-
tions to indemnify Agent, any Lender or Issuing Bank), and all
other charges and sums, as well as all costs and expenses, in-
cluding reasonable attorneys' fees and expenses, payable or reim-
bursable by Borrower under or pursuant to the Credit Agreement
and the other Credit Documents), whether direct or indirect,
contingent or noncontingent, matured or unmatured, accrued or not
accrued, liquidated or unliquidated, secured or unsecured, relat-
ed or unrelated to the Credit Agreement, whether or not now con-
templated, whether arising in contract, tort or otherwise, and
whether or not any instrument or agreement relating thereto spe-
cifically refers to this Guaranty.  Interest charges guaranteed
under this Guaranty shall include interest accruing during any
period that Borrower is a debtor in any case under any chapter of
the Bankruptcy Code or is the subject of an assignment for the
benefit of creditors or any bankruptcy, reorganization, insolven-
cy, readjustment of debt, trusteeship, receivership, dissolution
or liquidation law, statute or proceeding, whether or not a claim
for interest accruing after commencement of any such case or
proceeding is allowed in such case or proceeding.

              "person" shall mean any individual, corporation,
limited liability company, partnership, joint venture, associa-
tion, trust, business trust, Governmental Authority (or subdivi-
sion, agency or department thereof) or other entity of any kind.

              "Restored Payment" shall have the meaning assigned
to such term in Section 2 of this Guaranty.

              "Revocation Notice" shall mean a written notice by
any of Guarantors to Agent, each Lender and Issuing Bank of revo-
cation of such Guarantor's continuing agreements under this Guar-
anty.

        2.    Guaranty.  Each Guarantor hereby, jointly and sev-
erally with the other Guarantors, unconditionally, directly and
absolutely guarantees to Agent, each Lender and Issuing Bank,
their successors and assigns, payment by Borrower when due (whet-
her by demand, stated maturity, acceleration or otherwise) of all
of the Obligations.  This Guaranty shall be a continuing guaranty
and each of Guarantors hereby waives notice of acceptance of this
Guaranty with respect to each of the Obligations that may now
exist or may hereafter come into existence.  If any of the Obli-
gations are not paid when due (whether by demand, stated maturi-
ty, acceleration or otherwise), or if any other Event of Default
shall occur and be continuing, all of the Obligations shall, at
the option of Required Lenders, become due and payable for the
purposes of this Guaranty and the liability of each Guarantor
hereunder.  Each Guarantor further agrees that any claim which
such Guarantor may now or hereafter have against Agent, any of
Lenders or Issuing Bank or any other person for any reason what-
soever shall not affect such Guarantor's obligations under this
Guaranty and shall not be used or asserted against Agent, any
Lender or Issuing Bank as a defense to the performance of said
obligations or as a setoff, counterclaim or deduction against any
sums due hereunder.  Notwithstanding any partial or entire pay-
ment of all or any of the Obligations by any person, this Guaran-
ty shall remain in effect or be reinstated, as the case may be,
as though such payment had never been made, with respect to any
such payment which is rescinded or recovered from or restored or
returned by Agent, any Lender or Issuing Bank under authority of
any law, rule, regulation, order of court or governmental agency,
or in connection with any compromise or settlement relating ther-
eto or relating to any pending or threatened action, suit or
proceeding relating thereto, whether arising out of any proceed-
ings under the United States Bankruptcy Code or otherwise (each
such payment a "Restored Payment").

       3.    Representations and Warranties.  Each of Guarantors
represents and warrants to Agent, each of Lenders and Issuing
Bank that:  

             (a)    Authority, Enforceability and Conflicts. 
Such Guarantor has full power and authority to enter into this
Agreement and all other Credit Documents executed by it in con-
nection with this Agreement, to execute and deliver all documents
and instruments required hereunder and thereunder, and to incur
and perform the obligations provided for herein and therein, all
of which have been duly authorized by all necessary action, and
no consent or approval of any person, including, without limita-
tion, any Governmental Authority, which has not been obtained, is
required as a condition to the validity or enforceability hereof
or thereof.  This Agreement and all other Credit Documents exe-
cuted by such Guarantor in connection with this Agreement have
been duly executed and delivered by such Guarantor and consti-
tute, and will continue to constitute, the valid and legally
binding obligations of such Guarantor and are, and will continue
to be, fully enforceable against such Guarantor in accordance
with their terms, subject to bankruptcy and other laws affecting
the rights of creditors generally.  The execution, delivery and
performance by such Guarantor of this Agreement and all other
Credit Documents executed by such Guarantor in connection with
this Agreement, will not violate any Legal Requirement or any
material contract, agreement, instrument or other document or
obligation to which such Guarantor is a party or by which such
Guarantor, or any of its property, is bound.  Such Guarantor is
not in default under any material instrument, contract, agree-
ment, indenture, mortgage, deed of trust or other document or
obligation to which such Guarantor is a party or by which such
Guarantor, or any of its property, is bound.

             (b)    Corporate Matters.  Such Guarantor is a cor-
poration duly incorporated, legally existing and in good standing
under the laws of the state of its incorporation, has the power
to own its property and to conduct its business, and is duly
qualified to do business, and is in good standing, in each juris-
diction where the failure to be so qualified or in good standing
would have a material adverse effect on its ability to own, lease
or operate its property or conduct its business.  The chief exec-
utive office (within the meaning of Section 9-103 of the Maryland
Uniform Commercial Code) of such Guarantor is located at the
address indicated for such Guarantor in Schedule 3(b) to this
Guaranty, and all business, office and storage locations of such
Guarantor are located at the addresses indicated for such Guaran-
tor in Schedule 3(b) to this Guaranty.  All books and records of
such Guarantor are located at the address indicated for such
Guarantor in Schedule 3(b) to this Guaranty.

             (c)    Claims and Proceedings.  To the knowledge and
belief of such Guarantor after diligent inquiry and except as set
forth in Schedule 3(c) to this Guaranty (i) there are no judg-
ments, injunctions or similar orders or decrees outstanding
against such Guarantor, (ii) there are no claims, actions, suits
or proceedings pending or overtly threatened against such Guaran-
tor, or any of its property, at law or in equity, by or before
any Governmental Authority, and (iii) there are no strikes, work
stoppages, material grievance proceedings or other material con-
troversies pending or, to the knowledge and belief of such Guar-
antor, imminent or overtly threatened between such Guarantor and
any employees of such Guarantor or between such Guarantor and any
union or other collective bargaining unit representing employees
of such Guarantor.  Such Guarantor is not insolvent (as defined
in Section 101(32) of the United States Bankruptcy Code), unable
to pay its debts as they mature or engaged in business for which
its property is an unreasonably small capital.  Such Guarantor is
not and has not been the subject of any bankruptcy, reorganiza-
tion, insolvency, readjustment of debt, trusteeship, receiver-
ship, dissolution or liquidation law, statute or proceeding.

             (d)    Compliances.  Except as set forth in Sched-
ule 3(d) to this Guaranty, such Guarantor has filed all federal,
State, local and foreign tax returns which are required to be
filed by it, and has paid all federal, State, local and foreign
taxes shown to be due on such tax returns or which have been
assessed against it.  Such Guarantor has duly obtained and now
holds in full force and effect all licenses, permits, certifica-
tions, approvals and the like which it is required by any Legal
Requirement to hold and the failure to hold which could reason-
ably be expected to have a Material Adverse Effect.  Such Guaran-
tor is not in violation of, or, to the knowledge and belief of
such Guarantor, under investigation with respect to or threatened
to be charged with or given notice of a violation of, any Legal
Requirement, including, without limitation, ERISA, any Environ-
mental Laws or any law, rule, regulation or order relating to the
collection, payment and deposit of employees' income, unemploy-
ment or social security taxes or of sales, use or excise taxes,
or relating to occupational safety and health, or relating to
public health, except for any non-compliance which could not
reasonably be expected to result in the imposition of a Lien upon
any of the property, assets or revenues of such Guarantor or any
Other Obligor or expose such Guarantor or any Other Obligor to
potential liability in excess of One Hundred Thousand Dollars
($100,000.00).

             (e)    Material Litigation; Material Adverse Effect. 
There has not occurred any change in the assets, business, opera-
tions, business prospects or financial condition of such Guaran-
tor or its Subsidiaries which could reasonably be expected to
have a Material Adverse Effect.  No Material Litigation is pend-
ing or overtly threatened against such Guarantor or any of its
Subsidiaries.

             (f)    Environmental Matters.  To the knowledge and
belief of such Guarantor and except as set forth in Schedule 3(f)
to this Guaranty:  (i) no Hazardous Substance has been released,
discharged, emitted or disposed of on any real property or im-
provements owned, leased, subleased, occupied, used or operated
by such Guarantor or any of its Subsidiaries ("Real Property")
except in compliance with Environmental Laws and except as could
not reasonably be expected to result in the imposition of a Lien
upon any of the property, assets or revenues of such Guarantor,
any of its Subsidiaries or any Other Obligor or exposure of such
Guarantor, any of its Subsidiaries or any Other Obligor to po-
tential liability, whether for the cost of cure or remediation or
otherwise, in excess of One Hundred Thousand Dollars ($100,000.0-
0); (ii) there is no Hazardous Substance Contamination of any of
the Real Property which could reasonably be expected to result in
the imposition of a Lien upon any of the property, assets or
revenues of such Guarantor, any of its Subsidiaries or any Other
Obligor or exposure of such Guarantor, any of its Subsidiaries or
any Other Obligor to potential liability, whether for the cost of
cure or remediation or otherwise, in excess of One Hundred Thou-
sand Dollars ($100,000.00); (iii) all of the Real Property, and
all operations now or previously conducted on the Real Property
by such Guarantor or any of its Subsidiaries, comply with all
Environmental Laws, except for any non-compliance which could not
reasonably be expected to result in the imposition of a Lien upon
any of the property, assets or revenues of such Guarantor, any of
its Subsidiaries or any Other Obligor or exposure of such Guaran-
tor, any of its Subsidiaries or any Other Obligor to potential
liability, whether for the cost of cure or remediation or other-
wise, in excess of One Hundred Thousand Dollars ($100,000.00);
(iv) no underground storage tanks are located on any of the Real
Property; and (v) except as set forth in Schedule 3(f), neither
such Guarantor nor any of its Subsidiaries has received, or is
aware of, any Environmental Claim against, relating to or affect-
ing in any way such Guarantor or any of its Subsidiaries or any
operations conducted on any of the Real Property by such Guaran-
tor or any other Person which could reasonably be expected to
result in the imposition of a Lien upon any of the property,
assets or revenues of such Guarantor, any of its Subsidiaries or
any Other Obligor or exposure of such Guarantor, any of its Sub-
sidiaries or any Other Obligor to potential liability, whether
for the cost of cure or remediation or otherwise, in excess of
One Hundred Thousand Dollars ($100,000.00).

             (g)    Margin Stock.  None of the proceeds of any
Revolving Credit Loans or other credit extended pursuant to the
Credit Agreement will be used, directly or indirectly, for the
purpose of purchasing or carrying any "margin stock" (as defined
in Regulation U of the Board of Governors of the United States
Federal Reserve System) or for the purpose of maintaining, reduc-
ing or retiring any Indebtedness which was originally incurred to
purchase or carry any such margin stock or for any other purpose
which might constitute any of the transactions contemplated by
the Credit Agreement a "purpose credit" within the meaning of
such Regulation U or any other regulation of such Board of Gover-
nors.

        4.    Waiver of Trial by Jury.  Each of Guarantors agrees
and, by their acceptance hereof, each of Agent, Lenders and Issu-
ing Bank agrees, that any action, suit or proceeding involving
any claim, counterclaim or cross-claim arising out of or in any
way relating, directly or indirectly, to this Guaranty, the Cred-
it Agreement or the other Credit Documents, or any liabilities,
rights or interests of such Guarantor, Agent, any Lender, Issuing
Bank or any other person arising out of or in any way relating,
directly or indirectly, to any of the foregoing, shall be tried
by a court and not by a jury.  To the fullest extent permitted by
applicable law, each of Guarantors waives, and by their accep-
tance hereof, each of Agent, Lenders and Issuing Bank waives, any
right to trial by jury in any such action, suit or proceeding,
with the understanding and agreement that this waiver constitutes
a waiver of trial by jury of all claims, counterclaims and cross-
claims against all parties to such actions, suits or proceedings,
including claims, counterclaims and cross-claims against parties
who are not parties to this Guaranty, the Credit Agreement or the
other Credit Documents.  This waiver is knowingly, willingly and
voluntarily made by each of Guarantors, Agent, Lenders and Issu-
ing Bank and each of Guarantors acknowledges and agrees, and by
their acceptance hereof, each of Agent, Lenders and Issuing Bank
acknowledges and agrees, that this waiver of trial by jury is a
material aspect of the agreements among Guarantors, Agent, Lend-
ers and Issuing Bank and that no representations of fact or opin-
ion have been made by any person to induce this waiver of trial
by jury or to modify, limit or nullify its effect.

        5.    Additional Waivers.  Each of Guarantors hereby
waives notice of each and every one of the following acts, events
and/or conditions and agrees that, without necessity for any
express reservation of rights against any of Guarantors, neither
the occurrence or existence of any such act, event or condition,
nor Agent's, any Lender's or Issuing Bank's commission of or
omission to do any such act, event or condition, in any number of
instances, whether before or after receipt by Agent, Lenders and
Issuing Bank of a Revocation Notice, shall in any way release,
discharge, impair or diminish any obligations or liability of any
of Guarantors hereunder:  (a) the amendment, modification, renew-
al, extension or refinancing of, or the granting by Agent, any
Lender or Issuing Bank of any indulgence of any nature with re-
spect to, or the invalidity, voidability, unenforceability, com-
promise, settlement, release, waiver, discharge or impairment, in
whole or in part, of, the Credit Agreement, any of the other
Credit Documents, any of the Obligations or any obligation of any
Other Obligor with respect to any of the Obligations; (b) any
defense of Borrower or any Other Obligor to payment of any of the
Obligations; (c) the addition of any maker, guarantor, surety,
endorser, indemnitor or other person primarily or secondarily
liable for or obligated upon any of the Obligations; (d) assumpt-
ion of any of the Obligations by any other person, whether by
assignment, sale, merger, consolidation, sublease, conveyance or
otherwise; (e) delivery to Agent, any Lender or Issuing Bank or
acceptance by Agent, any Lender or Issuing Bank of any promissory
note or other instrument or writing evidencing or otherwise re-
lating to any of the Obligations; (f) the institution of any
suit, the obtaining of any judgment or the exercise of any other
right or remedy against Borrower or any Other Obligor, each of
Guarantors hereby agreeing that if any of the Obligations are not
paid when due (whether by demand, stated maturity, acceleration
or otherwise) or if an Event of Default shall occur and be con-
tinuing, legal proceedings to enforce payment under this Guaranty
may be instituted and prosecuted against any or all of Guarantors
without first having recourse to any other available security or
other available right or remedy; (g) the sale, exchange, pledge,
release, disposition, surrender, loss, destruction, damage to or
impairment of, any property now or hereafter directly or indi-
rectly securing any of the Obligations; (h) the creation, perfec-
tion, continuation, amendment, modification, invalidity, voidabi-
lity, unenforceability, compromise, settlement, subordination,
release, waiver, discharge, impairment or loss of priority, in
whole or in part, of, any security interest, lien or assignment
directly or indirectly securing any of the Obligations; and (i) -
any other event, circumstance or condition which might otherwise
constitute a legal or equitable discharge of a surety or a guar-
antor.  Each of Guarantors also hereby waives:  (a) all claims,
causes of action and rights of such Guarantor against Agent, any
Lender or Issuing Bank on account of actions taken or not taken
by any of them in the exercise of any of their rights or remedies
hereunder or under law, provided that the same did not arise from
their gross negligence or willful misconduct; (b) all claims and
causes of action of such Guarantor against Agent, any Lender or
Issuing Bank for punitive, exemplary, indirect, special, conse-
quential or other non-compensatory damages; (c) all rights of
redemption of such Guarantor with respect to any property direct-
ly or indirectly securing any of the Obligations or this Guaran-
ty; (d) all rights of such Guarantor to have marshalled any prop-
erty directly or indirectly securing any of the Obligations or
this Guaranty; (e) diligence in the enforcement or collection of
all of the Obligations, and presentment, demand, protest, notice
of protest, notice of dishonor and notice of nonpayment with
respect to all of the Obligations, and all other notices of any
kind whatsoever; (f) the benefit of any exemption of real proper-
ty or personal property from execution, levy or sale, whether now
existing or hereafter adopted; and (g) the benefit of any "one
action" or other statute or rule of law inconsistent with the
terms hereof.  Each of Guarantors also hereby waives any and all
rights of subrogation, reimbursement, contribution, indemnifica-
tion, exoneration and all other rights and claims which such
Guarantor may now or hereafter have against Borrower, or against
any other person directly or indirectly, contingently or noncon-
tingently, liable for or obligated upon any of the Obligations
("Other Obligated Party"), arising on account of this Guaranty or
any sums paid by Guarantor or collected pursuant to this Guaran-
ty.  In furtherance, and not in limitation, of the preceding
waiver, each of Guarantors agrees that any sums paid by Guarantor
or collected pursuant to this Guaranty shall be deemed a contri-
bution to the capital of Borrower or Other Obligated Party, as
the case may be, and shall not constitute any Guarantor a credi-
tor of Borrower or such Other Obligated Party.  Any money or
other property that Agent, any Lender or Issuing Bank may receive
in respect of any of the Obligations from any source whatsoever
may, subject to applicable law and agreements, be applied to any
of the Obligations, whether secured or unsecured.

        6.    Expenses.  Guarantors jointly and severally agree
to pay to Agent, each Lender and Issuing Bank, upon its demand
from time to time, the amount of all expenses, including reason-
able attorneys' fees and expenses, paid or incurred by it (a) in
exercising or enforcing or consulting with counsel concerning any
of its rights hereunder or under law, or (b) in defending any and
all non-meritorious or previously waived demands, claims, coun-
terclaims, cross-claims, causes of action, litigation and pro-
ceedings of every kind and nature asserted, commenced or insti-
tuted against it, or any of its officers, directors, employees or
agents, by any of Guarantors on account of, as a result of or
relating to, any action taken or not taken by Agent, any Lender
or Issuing Bank in connection with, the Obligations or enforce-
ment or exercise by it of any of its rights or remedies under
this Guaranty, the Credit Agreement or any of the other Credit
Documents.  Guarantors also jointly and severally agree to pay to
Agent, each Lender and Issuing Bank, upon its demand from time to
time, interest on the outstanding amount of such expenses paid by
it, from the date of its demand for payment of such expenses
until the same are paid in full, at the rate from time to time
applicable to Base Rate Loans.

        7.    Confession of Judgment.  Each of Guarantors hereby
authorizes any clerk of court or any attorney-at-law to appear
for such Guarantor before any court, having jurisdiction, within
the United States or elsewhere, and, after one or more complaints
filed, confess judgment against such Guarantor, either individu-
ally or jointly with any or all of the other Guarantors, as of
any time after any sums are payable hereunder for the amount of
such sums, together with attorneys' fees equal to fifteen percent
(15%) of the amount of such sums, for collection and release of
all errors, and without stay of execution, and inquisition and
extension upon any levy on real estate is hereby waived and con-
demnation agreed to, and the exemption of personal property from
levy and sale is also hereby expressly waived, and no benefit of
exemption shall be claimed under any exemption law now in force
or which may be hereafter adopted.  The foregoing authorities and
powers to confess judgment shall not be exhausted by one or more
exercises of them or by any imperfect exercise of them, shall not
be extinguished by any judgment entered because of them and may
be exercised before, during or after sale, liquidation or other
disposition Agent or any other person of any property directly or
indirectly securing any of the Obligations or exercise or en-
forcement by Agent, any Lender, Issuing Bank or any other person
of any other right or remedy with respect to the Obligations. 
Each of Guarantors agrees that any agreements of such Guarantor
contained in this Guaranty to pay any costs or expenses, includ-
ing attorneys' fees and expenses, paid or incurred by Agent, any
Lender or Issuing Bank shall not be merged into, or otherwise
impaired by, any such judgment by confession, but none of Agent,
Lenders and Issuing Bank shall be entitled to recover on account
of such costs or expenses any amount in excess of the greater of
(a) such costs or expenses included in any judgments by confes-
sion (without duplication), or (b) such costs or expenses actual-
ly paid or incurred by it.

        8.    Payments.  All payments required to be made by
Guarantors under this Guaranty shall be made by Guarantors with-
out setoff, counterclaim or deduction.  

        9.    Revocation and Continuation of Obligations.  Any
Guarantor may terminate such Guarantor's continuing agreements
under this Guaranty by giving a Revocation Notice; provided,
however, that no Revocation Notice shall be or become effective
until the fifth (5th) Business Day (the "Termination Date") after
the day on which such Revocation Notice shall have been received
by Agent, each Lender and Issuing Bank; and provided further that
no Revocation Notice shall diminish, impair or otherwise affect
the liability of any other Guarantor hereunder, or affect any
liability of such Guarantor hereunder with respect to (a) any
Obligations arising prior to the Termination Date, (b) any Obli-
gations arising on or after the Termination Date (i) on account
of or in connection with any Obligations arising prior to the
Termination Date, including interest accruing on such Obliga-
tions, or (ii) on account of or in connection with any contingent
or noncontingent commitment of any Lender or Issuing Bank (in-
cluding any Letter of Credit) issued prior to the Termination
Date, (c) any Obligations arising or re-arising on or after the
Termination Date on account of or in connection with any Restored
Payments originally received with respect to any Obligations
described in clauses (a) or (b) above and rescinded or recovered
from or restored or returned by Agent, any Lender or Issuing Bank
on or after the Termination Date, or (d) expenses paid or in-
curred by Agent, any Lender or Issuing Bank (and interest there-
on) which are payable or reimbursable by such Guarantor to Agent,
each Lender and Issuing Bank pursuant to this Guaranty, whether
paid or incurred prior to, on or after the Termination Date.  Any
Guarantor may revoke any Revocation Notice given by it, either
before or after the Termination Date, by giving notice thereof to
Agent, each Lender and Issuing Bank, whereupon the liability and
obligations of such Guarantor under this Guaranty shall continue
and be reinstated as though such Revocation Notice had not been
given.  Notwithstanding any Revocation Notice by any Guarantor,
such Guarantor shall continue to observe, comply with and perform
all warranties, covenants, conditions and agreements to be ob-
served, complied with or performed by such Guarantor under this
Guaranty until there shall have been paid in full (a) all Obliga-
tions arising prior to the Termination Date, (b) all Obligations
arising on or after the Termination Date (i) on account of or in
connection with Obligations arising prior to the Termination
Date, or (ii) on account of or in connection with all contingent
and noncontingent commitments of each Lender and Issuing Bank
issued prior to the Termination Date, and (c) all contingent and
noncontingent obligations and liabilities of such Guarantor to
Agent, each Lender and Issuing Bank under or pursuant to this
Guaranty.

       10.    Modifications and Notices.  No modification or
waiver of any provision of this Guaranty, and no consent to any
failure of any Guarantor to comply with any provision of this
Guaranty, shall be effective unless the same shall be in writing
and signed by the party against whom enforcement thereof is
sought, and then such modification, waiver or consent shall be
effective only in the specific instance and for the purpose for
which given.  No notice to or demand upon any Guarantor in any
circumstance shall entitle such Guarantor or any other Guarantor
to any other or further notice or demand in the same, similar or
other circumstances.  All notices, requests and demands to or
upon the respective parties hereto to be effective shall be in
writing and shall be deemed to have been duly given or made when
delivered by hand, or, if earlier, three (3) calendar days after
being deposited in the mail postage prepaid, provided that any
such notice or communication to any Guarantor shall be hand-de-
livered or transmitted to such Guarantor at the Guarantor Address
(or at such other address as such Guarantor may specify to Agent,
Lenders and Issuing Bank in writing from time to time), any such
notice or communication to Agent shall be hand-delivered or tra-
nsmitted to Agent at the Agent Notice Address (or at such other
address as Agent may specify to Guarantors in writing from time
to time), and any such notice or communication to any Lender or
Issuing Bank shall be hand-delivered or transmitted to such Lend-
er or Issuing Bank at the address provided for such person in
Subsection 10.3 of the Credit Agreement.  Notwithstanding the
foregoing, no Revocation Notice shall be or become effective
until the fifth (5th) Business Day after the day on which the
same shall actually have been received by Agent, each Lender and
Issuing Bank.

       11.    Applicable Law, Jurisdiction and Service of Pro-
cess.  The performance and construction of this Guaranty shall be
governed by the internal laws of the State of Maryland (exclusive
of principles of conflicts of laws).  Guarantor agrees that any
suit, action or proceeding instituted with respect to this Guar-
anty may be brought in any state or federal court located in the
State of Maryland.  Each of Guarantors consents to the in perso-
nam jurisdiction of such courts and irrevocably waives any objec-
tion to, and any right of immunity from, the jurisdiction of such
courts or the execution of judgments resulting therefrom, on the
grounds of venue or the convenience of the forum.  Each of Guar-
antors agrees that service of process in any such suit, action or
proceeding may be effected by mailing a copy thereof by regis-
tered or certified mail (or any substantially similar form of
mail), postage prepaid, to such Guarantor at the Guarantor Ad-
dress (or at such other address as such Guarantor may specify to
Agent, Lenders and Issuing Bank); provided, however, that nothing
contained herein shall affect the right to effect service of
process in any other manner permitted by law.

       12.    Successors and Invalidity.  This Guaranty shall be
binding upon and inure to the benefit of the parties hereto and
their respective successors and assigns, and each reference in
this Guaranty to any of the parties hereto shall be deemed to
include the successors and assigns of such party, including, in
the case of each Guarantor, the debtor, debtor in possession or
trustee in any case under any chapter of the United States Bank-
ruptcy Code in which such Guarantor is debtor.  Each of Guaran-
tors acknowledges and agrees that, subject to applicable law and
agreements, any of Lenders or Issuing Bank may at any time, in
its discretion, assign, transfer or pledge to any person, or
grant to any person a security interest in, this Guaranty, the
Credit Agreement, any of the other Credit Documents or any of its
rights hereunder or thereunder.  Subject to applicable law and
agreements, any of Lenders or Issuing Bank may sell, in such
amounts, upon such terms and to such persons as it may determine,
participations in its interests under this Guaranty, the Credit
Agreement and/or any of the other Credit Documents.  If any term,
provision or condition, or any part thereof, of this Guaranty
shall for any reason be found or held invalid or unenforceable by
any court or governmental agency, such invalidity or unenforceab-
ility shall not affect the remainder of such term, provision or
condition, nor any other term, provision or condition, and this
Guaranty shall survive and be construed as if such invalid or
unenforceable term, provision or condition had not been contained
herein; provided, however, that if any rate of interest provided
under this Guaranty does or shall exceed the maximum interest
rate which any Guarantor is permitted by law to agree to pay,
then such rate of interest shall immediately be deemed to be
reduced to such maximum rate and all previous payments of inter-
est in excess of the maximum rate shall be deemed to have been
payments in reduction of amounts bearing interest and not of
interest.

       13.    Survival and Merger.  All representations, warran-
ties, covenants and agreements of each of Guarantors contained
herein shall survive the execution and delivery of this Guaranty. 
This Guaranty contains the entire agreement of the parties with
respect to the matters covered and the transactions contemplated
hereby, and no agreement, statement or promise made by any Guar-
antor, Agent, any Lender or Issuing Bank, or by any of their
employees, officers, agents or attorneys, which is not contained
herein, shall be valid or binding.

      14.     Concerning the Credit Agreement.  Each of Guaran-
tors acknowledges that such Guarantor has received for its review
a complete copy of the Credit Agreement and the other Credit
Documents as in effect on the date hereof.

         IN WITNESS WHEREOF, Guarantor has caused this Guaranty
to be duly executed under seal the day and year first above writ-
ten.


ATTEST/WITNESS:                 AAI SYSTEMS MANAGEMENT, INC.
                                   AAI/ACL TECHNOLOGIES, INC.
                                   AAI ENGINEERING SUPPORT INC.
                                   AAI CALIFORNIA CARSHELL, INC.
                                   AAI MEDICAL CORPORATION



                                By:__________________________(S-
EAL)
                                     Paul J. Michaud
                                     Vice President of each of
                                     the foregoing Debtors

                                     
                                   
                                   
                                   
                                   




[SIGNATURES CONTINUED]
[SIGNATURES CONTINUED]


                                   UIC - DEL. CORPORATION
                                   AAI INTERNATIONAL, INC.
                                   AAI MICROFLITE SIMULATION
                                      INTERNATIONAL CORPORATION
                                   SETI, INC.



                                By:__________________________(S-
EAL)
                                     Paul J. Michaud
                                     President of each of the
                                     foregoing Debtors
                                     


                                SYMTRON SYSTEMS, INC.



                                By:__________________________(S-
EAL)
                                     Bernard Fein
                                     Chief Executive Officer


                                   UNITED INDUSTRIAL
                                      CORPORATION



                                By:__________________________(-
SEAL)
                                     Bernard Fein
                                     President

<PAGE>
STATE OF MARYLAND, CITY OF BALTIMORE, SS:

       I HEREBY CERTIFY that on this 13th day of October, 1994,
before me, the undersigned, a Notary Public of said State, per-
sonally appeared Paul J. Michaud, who acknowledged himself to be
the Vice President of each of AAI Systems Management, Inc., AAI/-
ACL Technologies, Inc., AAI Engineering Support Inc., AAI Cali-
fornia Carshell, Inc., and AAI Medical Corporation, and the Pres-
ident of each of UIC - DEL. Corporation, AAI International, Inc.,
AAI Microflite Simulation International Corporation and Seti,
Inc., and that he, as such, being authorized so to do, executed
the foregoing instrument for the purposes therein contained.

       WITNESS my hand and Notarial Seal.



                                                                 
                                        Notary Public

My Commission expires:

     10/1/97        


STATE OF                   , COUNTY/CITY OF              , SS:

       I HEREBY CERTIFY that on this _______ day of ___________-
_______, 1994, before me, the undersigned, a Notary Public of
said State, personally appeared Bernard Fein, who acknowledged
himself to be the Chief Executive Officer of Symtron Systems,
Inc., and the President of United Industrial Corporation, and
that he, as such, being authorized so to do, executed the forego-
ing instrument for the purposes therein contained.

       WITNESS my hand and Notarial Seal.



                                                                 
                                        Notary Public

My Commission expires:

                    





<PAGE>
     


                   AMENDMENT NO. 3 TO NOTE PURCHASE AGREEMENT

          AMENDMENT NO. 3 to NOTE PURCHASE AGREEMENT (this "Amendment No.
     3"), dated as of September [sic October]    , 1994, among AAI
                                              ---
     CORPORATION, a Maryland corporation (the "Company"), and PRINCIPAL
     MUTUAL LIFE INSURANCE COMPANY and THE TRAVELERS INSURANCE COMPANY
     (collectively, the "Purchasers").


                              W I T N E S S E T H 
                              - - - - - - - - - -

          WHEREAS, the Company and the Purchasers have heretofore entered
     into a Note Purchase Agreement dated as of July 15, 1992 (the "Note
     Purchase Agreement");

          WHEREAS, the Company and the Purchasers have heretofore entered
     into Amendment No. 1 to the Note Purchase Agreement dated as of July
     15, 1993 (the "Amendment No. 1");

          WHEREAS, the Company and the Purchasers have heretofore entered
     into an Amendment to the Note Purchase Agreement dated as of December
     30, 1993 (the "Amendment No. 2");

          WHEREAS, the Company has requested that the Purchasers agree to
     amend certain of the provisions and covenants contained in the Note
     Purchase Agreement, as amended; and

          WHEREAS, the Purchasers are willing to amend such provisions and
     covenants upon the terms and conditions herein provided.

          NOW, THEREFORE, in consideration of the mutual promises and
     consideration set forth herein, the sufficiency of which is hereby
     acknowledged, the parties hereto agree as follows:

          Section 1.     Definitions; References.  Unless otherwise
                         ------------------------
     specifically defined herein, each term used herein which is defined in
     the Note Purchase Agreement, as amended, shall have the meaning
     assigned to such term in the Note Purchase Agreement, as amended. 
     Each reference to "hereof," "hereunder," "herein" and "hereby" and
     each other similar reference to "this Agreement" and each other
     similar reference contained in the Note Purchase Agreement or
     Amendment No. 1 or Amendment No. 2, and each reference in the Notes to
     "the Note Purchase Agreement" or "Amendment No. 1" or " Amendment No.
     2," "thereunder," "thereof" or words of like import referring to the
     Note Purchase Agreement and Amendment No. 1 and Amendment No. 2, shall
     from and after the
























     
<PAGE>

<PAGE>
     

     date hereof refer to the Note Purchase Agreement as amended by
     Amendment No. 1, Amendment No. 2 and this Amendment No. 3.

          Section 1.1.   Definitions.   The following definitions are
                         ------------
     hereby amended, modified or added to the definitions set forth in the
     Note Purchase Agreement, as amended:


               "Accounts Credit Percentage":  eighty percent
               (80%) in the case of Eligible Accounts which did
               not arise from progress billings, and fifty
               percent (50%) in the case of Eligible Accounts
               which arose from progress billings, or in either
               case, such lesser percentage or percentages as
               shall from time to time be established by the
               Required Lenders, in the discretion of the
               Required Lenders exercised in good faith, and
               communicated to the Borrower in writing by the
               Agent, with respect to Eligible Accounts, specific
               Eligible Accounts or categories, types or
               components of Eligible Accounts.  Such less
               percentage or percentages may be based upon
               evaluations of risk by the Lenders or any other
               factors deemed relevant by the Lenders, whether or
               not such factors have theretofore been used,
               contemplated or foreseen as a basis for adjusting
               the Accounts Credit Percentage. 

               "Agent":  as of the date of the Credit Agreement,
               First Fidelity Bank, National Association in its
               capacity as party to the Credit Agreement as
               "Agent," and, after the date of the Credit
               Agreement, the person from time to time, party to
               the Credit Agreement as "Agent." 

               "Aggregate Borrowing Base Charge":  at a
               particular time, the sum of (a) the Aggregate
               Loans Outstanding of all Lenders as at such time
               and (b) L/C Exposure as at such time.

               "Aggregate Loans Outstanding":  as to any Lender
               at a particular time, the aggregate principal
               amount of the Revolving Credit Loans of such
               Lender outstanding as at such time.





























     NYFS11...:\95\78495\0001\7120\EXH02894.E00
<PAGE>

<PAGE>
     

               "Borrower":  shall mean AAI Corporation, a
               Maryland corporation.

               "Borrower Pledge Agreement":  shall mean, as the
               same may be waived, amended, modified, extended,
               renewed, supplemented or replaced from time to
               time, that certain Pledge and Security Agreement
               of even date herewith executed and delivered by
               Borrower in favor of Collateral Agent. 

               "Borrower Security Agreement":  shall mean, as the
               same may be waived, amended, modified, extended,
               renewed, supplemented or replaced from time to
               time, that certain Security Agreement of even date
               herewith executed and delivered by Borrower in
               favor of Collateral Agent.

               "Borrowing Base":  at a particular time, the
               product of (a) Eligible Accounts as at such time,
               and (b) the Accounts Credit Percentage.

               "Borrowing Base Certificate":  a report or
               schedule, certified by Borrower's Chief Financial
               Officer, in form and content satisfactory to the
               Required Lenders containing such information as
               the Required Lenders may require from time to time
               concerning the Borrowing Base, collections or
               other proceeds of accounts of the Borrower or its
               Subsidiaries and/or any other matter or matters as
               the Required Lenders may require from time to
               time, including with respect to accounts or
               contracts of the Borrower or its Subsidiaries and
               information concerning the cost to complete
               contracts of the Borrower or its Subsidiaries.

               "Collateral Agent":  shall mean as of the date of
               this Amendment No. 3, First Fidelity Bank,
               National Association in its capacity as party to
               the Intercreditor Agreement as "Collateral Agent,"
               and, after the date of this Amendment No. 3, the
               person from time to time, party to the
               Intercreditor Agreement as "Collateral Agent."
      































     
<PAGE>

<PAGE>
     

               "Collateral Agent Liens" shall mean, as the same
               may be amended, waived, modified, extended,
               renewed, supplemented or replaced from time to
               time, all security interests, liens, assignments
               and other encumbrances in or upon any property
               (real, personal or mixed) granted in favor of
               Collateral Agent pursuant to the Security
               Documents.

               "Credit Agreement":  shall mean, as the same may
               be amended, waived, modified, extended, renewed,
               supplemented or replaced from time to time, that
               certain Credit Agreement of even date herewith
               among Agent, Borrower, Lenders and Issuing Bank.

               "Collateral":  shall mean the property, rights and
               interests with are subject to the Collateral Agent
               Liens.

               "Eligible Accounts":  shall mean at a particular
               time, the aggregate amount, as at such time, of
               accounts of the Borrower and Eligible Affiliates
               which have been billed to the account debtors
               thereon, which are payable in conformity with such
               billings and which are, but only in the amounts
               such accounts are, acceptable to the Agent as at
               such time, in the discretion of the Agent
               exercised in good faith, as a basis for extensions
               of credit to the Borrower under this Agreement. 
               Except as otherwise agreed by the Agent from time
               to time, Eligible Accounts shall not include:  (a)
               any account which has remained unpaid for ninety
               (90) days or more after the billing thereof; (b)
               any account due from any Person other than the
               United States of America if fifty percent (50%) or
               more of all of the accounts due to the Borrower
               and Eligible Affiliates from such Person has
               remained unpaid for ninety (90) days or more after
               the billing thereof; (c) any account which arose
               out of any contract with the United States of
               America if fifty percent (50%) or more of the
               total amount due under such contract has remained
               unpaid for ninety (90) days or more after the
               billing thereof; (d) any account which is not






























     
<PAGE>

<PAGE>
     

               lawfully owned by the Borrower or an Eligible Affiliate,
               which has been assigned to the Borrower or an Eligible
               Affiliate, which is subject to any Lien except for permitted
               liens under the Credit Agreement, or in which the Borrower
               or the Eligible Affiliate, as the case may be, does not have
               the right and power to grant a security interest to the
               Collateral Agent in conformity with the Borrower Security
               Agreement, the Guarantor Security Agreement or the
               applicable Subsidiary Security Agreement, as the case may
               be, including any account the assignment of which is
               prohibited, limited or conditioned under any underlying or
               related contract; (e) any account with respect to which any
               transaction giving rise to or relating to the account was
               unlawful or not solicited and entered into in compliance
               with Requirements of Law; (f) any account which is not valid
               or enforceable or does not represent bona fide, undisputed
               indebtedness to the Borrower or an Eligible Affiliate of
               each obligor thereon; (g)  any account in which the
               Collateral Agent does not have a perfected first priority
               security interest; (h) any account evidenced in whole or in
               part by any instrument or chattel paper unless such
               instrument or chattel paper has been delivered to the
               Collateral Agent, together with such endorsements or
               assignments as the Collateral Agent may reasonably require;
               (i) any account to the extent that the account is subject to
               any defense, set-off, counterclaim, credit, discount,
               allowance, adjustment, deduction or reduction of any kind;
               (j) any account to the extent that such account includes any
               finance or similar charges on account of past due amounts;
               (k) any account with respect to which any obligor thereon is
               a Person of whom the Borrower or the Eligible Affiliate, as
               the case may be, is or becomes any account debtor or obligor
               by virtue of any obligation of the Borrower or such Eligible
               Affiliate to such Person not relating to accounts due or to
               become due from such Person to the Borrower or such Eligible
               Affiliate; (l) any account to the






































     
<PAGE>

<PAGE>
     

               extent that any goods, the sale or lease of which gave rise
               to the account, have been returned, rejected, lost or
               damaged prior to acceptance of such goods by the purchaser
               or lessee thereof; (m) any account which arose from the sale
               of goods, if such sale was not an absolute sale or was a
               sale on consignment, on approval or on a sale-or-return
               basis, or if such sale is subject to any repurchase or
               return agreement, or if such sale is subject to any other
               term by reason of which the obligation of any obligor
               thereon is contingent or conditional; (n) any account which
               did not arise in the ordinary course of business of Borrower
               or the Eligible Affiliate, as the case may be; (o) any
               account which arose out of a contract with the United States
               of America or any state, county, municipality or other
               Governmental Authority, or any department or agency thereof,
               to the extent that sums due or to become due in connection
               therewith have not been duly assigned to the Agent in
               accordance with the Federal Assignment of Claims Act and/or
               any other applicable federal, state and local laws, rules
               and regulations, relating to the assignment or payment of
               such contract and sums; (p) any account with respect to
               which any obligor thereon is insolvent (as defined in
               Section 101 (32) of the United States Bankruptcy Code), is
               unable to pay its debts as they mature, or is the subject of
               any pending, imminent or threatened bankruptcy,
               reorganization, insolvency, readjustment of debt,
               trusteeship, receivership, dissolution or liquidation law,
               statute or proceeding; (q) any account which arose out of a
               contract which is subject to any bonding or other similar
               arrangement as security for any obligations of the Borrower,
               any of its Subsidiaries or any Guarantor in connection   
               with which any Lien has been granted, incurred or assumed
               upon any property, assets or revenues, whether now owned or
               hereafter acquired, of any of Borrower, any of its
               Subsidiaries or any Guarantor; (r) any account with respect
               to which any obligor






































     
<PAGE>

<PAGE>
     

               thereon is an Affiliate of the Borrower or any Other
               Obligor; (s) any account with respect to which the principal
               place of business of any obligor thereon is not located in
               the United States of America, except to the extent that such
               account is (i) secured by a letter of credit or bond
               satisfactory to the Collateral Agent issued or confirmed by
               a bank or provided by a surety which is satisfactory to the
               Collateral Agent and which is organized under the laws of
               the United sates or any state thereof or (ii) guaranteed by
               the United States of America or any agency thereof on terms
               and conditions satisfactory to the Collateral Agent; (t) any
               account which arose out of a contract with the United States
               of America or any other Governmental Authority to the extent
               that (i) funds for the payment of such account have not been
               appropriated by the United States of America or such other
               Governmental Authority or (ii) the Collateral Agent is not
               satisfied, in its discretion exercised in good faith, that
               such account and contract is enforceable against the full
               faith and credit of the United States of America or such
               other Governmental Authority and that funds for the payment
               of such account are available.  Notwithstanding the
               provisions of clause (s) of this definition, accounts of the
               Borrower due from Marubun Corporation, a Japanese
               corporation ("Marubun"), which otherwise qualify as Eligible
               Accounts may constitute Eligible Accounts even though they
               would otherwise be excluded by such clause (s), provided
               that, except as otherwise agreed by the Agent from time to
               time:  (i) notwithstanding the provisions of clause (a) of
               this definition, no account of the Borrower due from Marubun
               shall constitute an Eligible Account if such account has
               remained unpaid for thirty (30) days or more after the
               billing thereof; (ii) notwithstanding the provisions of
               clause (b) of this definition, no account of the Borrower
               due from Marubun shall constitute an Eligible Account if
               fifty percent (50%) or more of all of the accounts due the
               Borrower






































     
<PAGE>

<PAGE>
     

               and Eligible Affiliates from such Person has remained unpaid
               for thirty (30) days or more after the billing thereof; and
               (iii) the product of (x) the Accounts Credit Percentage and
               (y) the aggregate amount of accounts of the Borrower due
               from Marubun constituting Eligible Accounts, shall not at
               any time exceed Two Hundred Fifty Thousand Dollars
               ($250,000.00).  The Agent may determine from time to time in
               its discretion exercised in good faith and notwithstanding
               any previous contrary determinations made by the Collateral
               Agent, to exclude from or include in Eligible Accounts
               specific accounts (including accounts due from Marubun),
               categories or types of accounts (including accounts due from
               Marubun), or specific components of accounts (including
               accounts due from Marubun).  Such determinations may be
               based upon evaluations of risk by the Collateral Agent or
               any other factors deemed relevant by the Collateral Agent,
               whether or not such factors have theretofore been used,
               contemplated or foreseen as a basis for limiting Eligible
               Accounts.  Any such determinations by the Collateral Agent
               will be promptly communicated in writing to the Borrower.  
                                 
               "Eligible Affiliate":  shall mean at a particular
               time (a) each Eligible Borrower Subsidiary as at
               such time and (b) Symtron, provided that the
               Lender Guaranty is subsisting as at such time with
               respect to Symtron, the Guarantor Security
               Agreement is subsisting as at such time with
               respect to Symtron and that the security interests
               granted by Symtron pursuant to the Guarantor
               Security Agreement are duly perfected as at such
               time and subject only to permitted liens under the
               Credit Agreement.


               "Eligible Borrower Subsidiary":  shall mean at a
               particular time, a Subsidiary of the Borrower
               which has executed and delivered to the Collateral
               Agent a Subsidiary Guaranty subsisting as at such
               time, a Subsidiary



































     
<PAGE>

<PAGE>
     

               Security Agreement subsisting as at such time, such
               financing statements as may be required by the Agent and
               such other documents and instruments as may be required
               pursuant under the Credit Agreement or any Security
               Documents, provided that the security interests granted by
               such Subsidiary pursuant to such Subsidiary Security
               Agreement are duly perfected as at such time and subject
               only to permitted liens under the Credit Agreement.  

               "First Fidelity":  shall mean First Fidelity Bank,
               National Association.

               "Governmental Authority":  shall mean any nation
               or government, any state or other political
               subdivision thereof and any entity exercising
               executive, legislative, judicial, regulatory or
               administrative functions of or pertaining to
               government, and any Person owned or controlled
               directly or indirectly by any of the foregoing,
               whether domestic or foreign. 

               "Guarantor Security Agreement":  shall mean as
               waived, amended, modified, extended, renewed,
               supplemented or replaced from time to time, the
               Security Agreement to be executed and delivered by
               the Lender Guarantors (other than UIC) in favor of
               the Collateral Agent, for the ratable benefit of
               the Lenders, the Issuing Bank and the Noteholders,
               pursuant to which each of the Lender Guarantors
               (other than UIC) shall, among other things, grant
               to the Collateral Agent a security interest in all
               of its present and future accounts, chattel paper,
               instruments, documents of title, general
               intangibles, equipment, inventory and other
               assets.  

               "Indemnified Letters of Credit":  the collective
               reference to letters of credit issued by Signet
               Bank/Maryland for the account of the Borrower and
               subject to the Issuing Bank L/C Indemnification
               Agreement.

































     
<PAGE>

<PAGE>
     

               "Intercreditor Agreement":  shall mean, as the
               same may be amended, waived, modified, extended,
               renewed, supplemented or replaced from time to
               time, that certain Intercreditor Agreement of even
               date herewith by and among The Travelers Insurance
               Company, a Connecticut corporation, Principal
               Mutual Life Insurance Company, an Iowa
               corporation, First Fidelity Bank, National
               Association in its capacity as Lender, in its
               capacity as Agent, in its capacity as Issuing
               Bank, and in its capacity (in such capacity,
               "Collateral Agent") as grantee and beneficiary of
               the Collateral Agent Liens, and the Bank of
               Baltimore in its capacity as Lender.

               "Issuing Bank":  shall mean, as of the date of the
               Credit Agreement, First Fidelity Bank, National
               Association, in its capacity as party to the
               Credit Agreement as "Issuing Bank," and, after the
               date of the Credit Agreement, the person from time
               to time party to the  Credit Agreement as "Issuing
               Bank."

               "Issuing Bank L/C Indemnification Agreement":  as
               amended, modified, extended, renewed, supplemented
               or replaced from time to time, a letter agreement
               to be executed and delivered between the Issuing
               Bank and Signet Bank/Maryland, satisfactory in
               form and content to the Issuing Bank, pursuant to
               which the Issuing Bank shall indemnify Signet
               Bank/Maryland in connection with certain letters
               of credit issued by Signet Bank/Maryland for the
               account of the Borrower.

               "L/C Aggregate Undrawn Amount":  at a particular
               date, the aggregate undrawn amount, as at such
               date, of all Letters of Credit and all Indemnified
               Letters of Credit issued and outstanding.

               "L/C Agreements":  shall mean, as amended,
               modified, extended, renewed, supplemented or
               replaced from time to time, applications and
               reimbursement and other agreements in form































     
<PAGE>

<PAGE>
     

               and content and executed by Persons satisfactory to the
               Issuing Bank requesting issuance of one or more Letters of
               Credit and setting forth reimbursement obligations and other
               terms and conditions relating thereto.

               "L/C Exposure":  at a particular time, the sum of
               (a) the L/C Aggregate Undrawn Amount as at such
               time and (b) L/C Reimbursement Obligations as at
               such time.

               "L/C Reimbursement Obligations":  at a particular
               time, the aggregate amount of all drawings made
               under Letters of Credit and Indemnified Letters of
               Credit which, as at such time, have not been
               reimbursed by the Borrower to the Issuing Bank or
               Signet Bank/Maryland, as the case may be.

               "Lenders":  shall mean, as of the date of the
               Credit Agreement, First Fidelity Bank, National
               Association, and Bank of Baltimore, each in its
               capacity as party to the Credit Agreement as a
               "Lender," and, after the date of this Agreement,
               all persons from time to time parties to the
               Credit Agreement, as "Lenders."

               "Lender Guarantors":  shall mean, collectively,
               the Guarantor, UIC-Del. Corporation, a Delaware
               corporation, and the Restricted Subsidiaries.
      
               "Lender Guaranty":  shall mean, as the same may be
               amended, waived, modified, extended, renewed,
               supplemented or replaced from time to time, that
               certain Guaranty of even date herewith executed
               and delivered by Lender Guarantors in favor of
               Agent, Lenders and Issuing Bank.

               "Letter of Credit":  shall mean, commercial and
               standby letters of credit issued for the account
               of the Borrower, for such purposes, in such
               amounts, for the benefit of such Persons and
               subject to such terms and conditions as may be
               acceptable to the Issuing Bank and the Required
               Lenders in































     
<PAGE>

<PAGE>
     

               their discretion exercised in good faith (individually, as
               amended, modified, extended, renewed, supplemented or
               replaced from time to time, a "Letter of Credit," and
               collectively, the "Letters of Credit").

               "Lien":  shall mean any mortgage, pledge,
               hypothecation, assignment, deposit arrangement,
               encumbrance, lien (statutory or other) or
               preference, priority or other security agreement
               or preferential arrangement of any kind or nature
               whatsoever (including, without limitation, any
               conditional sale or other title retention
               agreement, any financing lease of any property
               (real, personal or mixed) as in conformity with
               generally accepted accounting principles would be
               required to be capitalized on a balance sheet of
               such Person having substantially the same economic
               effect as any of the foregoing, and the filing of
               any financing statement under the Uniform
               Commercial Code or comparable law or any
               jurisdiction in respect of any of the foregoing).

               "Other Obligor":  shall mean each of the Lender
               Guarantors and each other Person other than the
               Borrower that is now or hereafter primarily or
               secondarily, or contingently or noncontingently,
               liable for or obligated upon or in connection with
               any obligations of Borrower to Agent, any Lender
               or Issuing Bank, whether or not so liable, that
               has granted any lien or security interest to the
               Collateral Agent as security for any of such
               obligations or any obligations of any other Person
               in connection with any of such obligations. 

               "Person":  an individual, partnership,
               corporation, limited liability company, business
               trust, joint stock company, trust, unincorporated
               association, joint venture, Governmental Authority
               or other entity of whatever nature. 



































     
<PAGE>

<PAGE>
     

               "Required Lenders":  at a particular time, a
               Lender or Lenders holding more than sixty percent
               (60%) of the Aggregate Loans Outstanding of all
               Lenders under the Credit Agreement as at such time
               or, if no Lender has any Revolving Credit Loans
               outstanding under the Credit Agreement from time
               to time, a Lender or Lenders whose commitment
               percentages as identified in the Credit Agreement
               aggregate more than sixty percent (60%) as at such
               time.

               "Requirements of Law":  shall mean as to any
               Person, the certificate of incorporation and by-
               laws or other organizational or governing
               documents of such Person, and any law, treaty,
               rule or regulation or determination of an
               arbitrator or a court or other Governmental
               Authority, in each case applicable to or binding
               upon such Person or any of its property or to
               which such Person or any of its property is
               subject.

               "Restricted Subsidiaries":  mean (i) AAI
               Engineering Support, Inc., a Maryland corporation,
               AAI Microflite Simulation International
               Corporation, a Maryland Corporation, AAI/ACL
               Technologies, Inc., a Maryland corporation, Seti,
               Inc., a Pennsylvania corporation, AAI Systems
               Management, Inc., a Maryland corporation and AAI
               California Carshell, Inc., a Maryland corporation;
               (ii) any other Subsidiary with respect to which
               the Company has notified the Noteholders that it
               has been designated as such by the Board of
               Directors of the Company or by an Executive
               Officer of the Company who has been authorized by
               such Board of Directors to make such designation;
               and (iii) Symtron Systems, Inc., a New Jersey
               corporation, a wholly owned subsidiary of UIC.

               "Revolving Credit Loans":  at a particular time
               and from time to time the revolving credit loans
               made by the Lender or Lenders to the Borrower
               under Section 2.1 of the Credit Agreement.































     
<PAGE>

<PAGE>
     

               "Revolving Credit Notes":  shall mean the
               promissory notes of the Borrower evidencing the
               revolving credit loan or loans made under the
               Credit Agreement, from time to time, appropriately
               completed, as amended, modified, extended,
               renewed, supplemented or replaced from time to
               time, payable to the order of such Lender and
               further evidencing the obligation of the Borrower
               to pay with interest the aggregate loans
               outstanding under the Credit Agreement to such
               Lender from time to time. 
      
               "Security Documents":  shall mean, as the same may
               be amended, waived, modified, extended, renewed,
               supplemented or replaced from time to time, that
               certain Pledge and Security Agreement of even date
               herewith executed and delivered by the Borrower in
               favor of Collateral Agent, that certain Security
               Agreement of even date herewith executed and
               delivered by the Borrower in favor of the
               Collateral Agent, that certain Security Agreement
               of even date herewith executed and delivered by
               the Restricted Subsidiaries, et al in favor of
               Collateral Agent, that certain Deed of Trust and
               Security Agreement of even date herewith executed
               and delivered by the Borrower in favor of certain
               trustees for the benefit of Collateral Agent, that
               certain Assignment of Leases and Rents of even
               date herewith executed and delivered by the
               Borrower in favor of the Collateral Agent, that
               certain Pledge and Security Agreement of even date
               herewith executed and delivered by Guarantor in
               favor of Collateral Agent, that certain Collateral
               Assignment of Trademarks Agreement of even date
               herewith executed and delivered by the Borrower in
               favor of the Collateral Agent, that certain
               Collateral Assignment of Patents of even date
               herewith executed and delivered by the Borrower in
               favor of the Collateral Agent, that certain
               Collateral Assignment of Trademarks of even date
               herewith executed and delivered by Symtron
               Systems, Inc. in favor of the Collateral Agent,
               that certain Collateral Assignment of































     
<PAGE>

<PAGE>
     

               Patents of even date herewith executed and delivered by
               Symtron Systems, Inc. in favor of Collateral Agent, that
               certain Collateral Assignment of Trademarks of even date
               herewith executed and delivered by AAI/ACL Technologies,
               Inc. in favor of the Collateral Agent, that certain
               Collateral Assignment of Copyrights of even date herewith
               executed and delivered by AAI/ACL Technologies, Inc. in
               favor of the Collateral Agent, and that certain Collateral
               Assignment of Patents of even date herewith executed and
               delivered by AAI/ACL Technologies, Inc. in favor of
               Collateral Agent.

               "Subsidiary":  of a Person means (i) any
               corporation or other entity of which securities or
               other ownership interests having ordinary voting
               power to elect a majority of the board of
               directors or other persons performing similar
               functions are at the time, directly or indirectly,
               owned by such Person, or (ii) the management of
               which is otherwise controlled, directly or
               indirectly, through one or more intermediaries, by
               such Person.

               "Subsidiary Guaranty":  shall mean as waived,
               amended, modified, extended, renewed, supplemented
               or replaced from time to time a guaranty in form
               substantially similar to the Lender Guaranty, but
               in form and content satisfactory to the Required
               Lenders, pursuant to which a Subsidiary of the
               Borrower shall, among other things guarantee
               payment of the obligations of the Borrower to the
               Agent, the Lenders and the Issuing Bank.

               "Subsidiary Security Agreement":  shall mean as
               waived, amended, modified, extended, renewed,
               supplemented or replaced from time to time, a
               security agreement in form substantially similar
               to the Guarantor Security Agreement, but in form
               and content satisfactory to Required Lenders,
               executed and delivered between the Agent and a
               Subsidiary of Borrower pursuant to which such
               Subsidiary shall, among other things, grant
































     
<PAGE>

<PAGE>
     

               to the Collateral Agent, for the ratable benefit of the
               Lenders, the Issuing Bank and the Noteholders, a security
               interest in all accounts, chattel paper documents of title,
               general intangibles, instruments, equipment, inventory and
               other assets of such Subsidiary.

               "Symtron":  shall mean Symtron Systems, Inc., a
               New Jersey corporation." 

          Section 2.     Amendment of Section 6.8.  Restriction on Liens. 
                         -----------------------------------------------
     Subsections (vi), (vii) and (viii) be and hereby are added to Section
     6.8 of the Note Purchase Agreement, as amended, as follows:

               "(vi)     Liens in favor of the Collateral Agent
               created pursuant to the Security Documents
               securing the obligations under the Credit
               Agreement and the Revolving Credit Notes and under
               this Agreement and the Notes.

               (vii)     Liens in favor of or for the benefit of
               the Issuing Bank in or upon cash, cash equivalents
               or other liquid assets pledged to the Issuing Bank
               in connection with, or in or upon bills of lading
               or other shipping or transportation documents,
               warehouse receipts or similar rights arising in
               connection with, the L/C Agreements or the
               issuance and payment of drawings under Letters of
               Credit.

               (viii)    Liens in favor of or for the benefit of
               the Agent or any Lender in or upon cash, cash
               equivalents, marketable securities or other liquid
               assets and other rights relating to or in
               connection with overnight investments or other
               investments made or managed by the Agent or any
               Lender for or on behalf of the Borrower, any of
               its Subsidiaries or Symtron."

          Section 3.     Amendment of Section 6.11.  Guaranties.  Section
                         --------------------------------------
     6.11 of the Note Purchase Agreement is amended to read in its entirety
     as follows:































     
<PAGE>

<PAGE>
     

               "Section 6.11. Guaranties.    The Company will 
                              ----------
               not, and will not permit any Restricted Subsidiary to, at
               any time, make, suffer to exist or become liable with
               respect to guarantees of obligations of any Person or
               Persons in excess of an aggregate of $5,000,000.00, except
               that the Restricted Subsidiaries shall be permitted to
               guarantee the obligations of the Company under the Credit
               Agreement, the Revolving Credit Notes and the Lender
               Guaranty to the Lenders and to pledge their respective
               Collateral as security for such obligations by executing and
               delivering the Security Documents."

          Section 4.     Borrowing Base Certificate.  The following new
                         --------------------------
     subparagraph (c) be and hereby is added to Section 5.1, as follows:

               "(c)  The Company agrees to promptly deliver to
               each of the Noteholders a copy of any Borrowing
               Base Certificate that it shall hereafter deliver
               to the Required Lenders in the Company's capacity
               as Borrower under the Credit Agreement that states
               that (a) the Aggregate Borrowing Base Charge
               exceeds (b) the Borrowing Base, provided, however,
               that the Company shall have no monetary liability,
               whether direct, incidental, consequential or
               otherwise, to any Noteholder or any other Person
               on account of any failure of the Company to so
               give such written notification to any Noteholder."

          Section 5.     No Other Amendment.  Except as specifically set
                         ------------------
     forth herein, the Note Purchase Agreement shall remain in full force
     and effect in accordance with its terms.

          Section 6.     Governing Law.  This Amendment No. 3 shall be
                         -------------
     governed by and construed in accordance with the laws of the  State of
     New York.

          Section 7.     Counterparts.  This Amendment No. 3 may be
                         ------------
     executed in any number of counterparts and by different parties hereto
     in separate counterparts, each of which when so executed shall be
     deemed to be an original and all of which taken together shall
     constitute one and the same agreement.




























     
<PAGE>

<PAGE>
     

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment
     No. 3 to Note Purchase Agreement to be executed by their respective
     officers thereunto duly authorized as of the date first above written.

                              AAI CORPORATION


                              By:                                   
                                 -----------------------------------
                              Name: Paul J. Michaud                   
                                   ---------------------------------
                              Title: Vice President, Chief Financial 
                                    --------------------------------
                                    Officer and Treasurer              
                                    --------------------------------

                              PRINCIPAL MUTUAL LIFE INSURANCE COMPANY


                              By:                                    
                                 ------------------------------------
                              Name:                                  
                                   ----------------------------------
                              Title:                                 
                                    ---------------------------------


                              By:                                    
                                 ------------------------------------
                              Name:                                  
                                   ----------------------------------
                              Title:                                 
                                    ---------------------------------


                              THE TRAVELERS INSURANCE COMPANY


                              By:                                     
                                 -------------------------------------
                              Name:                                   
                                   -----------------------------------
                              Title:                              
                                    ----------------------------------


































<PAGE>
     


                      AMENDMENT NO. 2 TO GUARANTY AGREEMENT

          THIS AMENDMENT NO. 2 to GUARANTY AGREEMENT (this "Amendment No.
     2") dated as of September [sic October]    , 1994, among United
                                             ---
     Industrial Corporation, a Delaware corporation (herein called the
     "Guarantor"), to Principal Mutual Life Insurance Company and The
     Travelers Insurance Company (collectively, the "Purchasers") and their
     respective successors and assigns as holders of the Notes hereinafter
     described (the "Noteholders").

                               W I T N E S S E T H
                               - - - - - - - - - -
          WHEREAS, the Guarantor and the Noteholders have heretofore
     entered into a Guaranty Agreement dated as of July 15, 1992 (the
     "Guaranty Agreement"); 

          WHEREAS, the Guarantor and the Noteholders have heretofore
     entered into an Amendment No. 1 to the Guaranty Agreement dated as of
     July 15, 1993 (the "Amendment No. 1");
         
          WHEREAS, the Guarantor has requested that the Noteholders agree
     to amend certain provisions and covenants contained in the Guaranty
     Agreement, as amended; and

          WHEREAS,  the Noteholders are willing to amend such provisions
     and covenants upon the terms and conditions herein provided.

          NOW, THEREFORE, the parties hereto, in consideration of the
     mutual promises made herein, the sufficiency of which is hereby
     acknowledged, hereby agree as follows:

          Section 1.      Definitions; References.     Unless otherwise
                          -----------------------
     specifically defined herein, each term used herein which is defined in
     the Guaranty Agreement, as amended shall have the meaning assigned to
     such term in the Guaranty Agreement, as amended.  Each reference to
     "hereof," "hereunder," "herein" and "hereby" and each other similar
     reference to in "this Agreement," and each other similar reference
     contained in the Guaranty Agreement, Amendment No. 1 or Amendment No.
     2, shall from and after the date hereof refer to the Guaranty
     Agreement as amended by Amendment No. 1 and this Amendment No. 2.

          Section 1.1.   The following definitions are hereby added to the
     definitions under the Guaranty Agreement, as amended:

          ""Agent":  as of the date of the Credit Agreement, First
          Fidelity Bank, National Association in its
























<PAGE>

<PAGE>
     

          capacity as party to the Credit Agreement as "Agent," and, after
          the date of the Credit Agreement, the person from time to time,
          party to the Credit Agreement as "Agent."

          "Aggregate Loans Outstanding":  as to any Lender at a
          particular time, the aggregate principal amount of the
          Revolving Credit Loans of such Lender outstanding at such
          time.

          "Borrower":  shall mean AAI Corporation, a Maryland
          Corporation.

          "Collateral Agent":  shall mean as of the date of this
          Amendment No. 2, First Fidelity Bank, National Association
          in its capacity as party to the Intercreditor Agreement as
          "Collateral Agent," and, after the date of this Amendment
          No. 2, the person from time to time, party to the
          Intercreditor Agreement as "Collateral Agent."

          "Collateral Agent Liens":  shall mean, as the same may be
          amended, waived, modified, extended, renewed, supplemented
          or replaced from time to time, all security interests,
          liens, assignments and other encumbrances in or upon any
          property (real, personal or mixed) granted in favor of
          Collateral Agent pursuant to the Security Documents.
       
          "Credit Agreement":  shall mean, as the same may be amended,
          waived, modified, extended, renewed, supplemented or
          replaced from time to time, that certain Credit Agreement of
          even date herewith among Agent, Borrower, Lenders and
          Issuing Bank.

          "First Fidelity":  shall mean First Fidelity Bank, National
          Association.

          "Governmental Authority":  shall mean any nation or
          government, any state or other political subdivision thereof
          and any entity exercising executive, legislative, judicial
          regulatory or administrative functions of or pertaining to
          government, and any Person owned or controlled directly or
          indirectly by any of the foregoing, whether domestic or
          foreign.

          "Intercreditor Agreement":  shall mean, as the same may be
          amended, waived, modified, extended, renewed,





























     NYFS11...:\95\78495\0001\7120\GUA02894.E40
<PAGE>

<PAGE>
     

          supplemented or replaced from time to time, that certain
          Intercreditor Agreement of even date herewith by and among The
          Travelers Insurance Company, a Connecticut corporation, Principal
          Mutual Life Insurance Company, an Iowa corporation, First
          Fidelity Bank, National Association in its capacity as Lender, in
          its capacity as Agent, in its capacity as Issuing Bank, and in
          its capacity (in such capacity, "Collateral Agent") as grantee
          and beneficiary of the Collateral Agent Liens, and The Bank of
          Baltimore in its capacity as Lender."

          "Issuing Bank":  shall mean, as of the date of the Credit
          Agreement, First Fidelity Bank, National Association, in its
          capacity as party to the Credit Agreement as "Issuing Bank,"
          and, after the date of the Credit Agreement, the person from
          time to time party to the Credit Agreement as "Issuing
          Bank."  

          "L/C Agreements":  shall mean, as amended, modified,
          extended, renewed, supplemented or replaced from time to
          time, applications and reimbursement and other agreements in
          form and content and executed by Persons satisfactory to the
          Issuing Bank requesting issuance of one or more Letters of
          Credit and setting forth reimbursement obligations and other
          terms and conditions relating thereto.

          "Lenders":  shall mean, as of the date of the Credit
          Agreement, First Fidelity Bank, National Association, and
          Bank of Baltimore, each in its capacity as party to the
          Credit Agreement as a "Lender," and, after the date of the
          Credit Agreement, all persons from time to time parties to
          the Credit Agreement as "Lenders."

          "Letter of Credit":  shall mean, commercial and standby
          letters of credit issued for the account of the Borrower,
          for such purposes, in such amounts, for the benefit of such
          Persons and subject to such terms and conditions as may be
          acceptable to the Issuing Bank and the Required Lenders in
          their discretion exercised in good faith (individually, as
          amended, modified, extended, renewed, supplemented or
          replaced from time to time, a "Letter of Credit," and
          collectively, the "Letters of Credit"). 

          "Person":  an individual, partnership, corporation, limited
          liability company, business trust, joint stock






























     
<PAGE>

<PAGE>
     

          company, trust, unincorporated association, joint venture,
          Governmental Authority or other entity of whatever nature.  

          "Required Lenders":  at a particular time, a Lender or
          Lenders holding more than sixty percent (60%) of the
          Aggregate Loans Outstanding of all Lenders under the Credit
          Agreement as at such time or, if no Lender has any Revolving
          Credit Loans outstanding under the Credit Agreement from
          time to time, a Lender or Lenders whose commitment
          percentages as identified in the Credit Agreement aggregate
          more than sixty percent (60%) as at such time. 

          "Restricted Subsidiaries":  shall mean (i) AAI Engineering
          Support, Inc., a Maryland corporation, AAI Microflite
          Simulation International Corporation, a Maryland
          Corporation, AAI/ACL Technologies, Inc., a Maryland
          corporation, Seti, Inc., a Pennsylvania corporation, AAI
          Systems Management, Inc., a Maryland corporation and AAI
          California Carshell, Inc., a Maryland corporation; (ii) any
          other Subsidiary with respect to which the Company has
          notified the Noteholders that it has been designated as such
          by the Board of Directors of
          the Company or by an Executive Officer of the Company who
          has been authorized by such Board of Directors to make such
          designation; and (iii) Symtron Systems, Inc., a New Jersey
          corporation, a wholly owned subsidiary of Guarantor.

          "Revolving Credit Loans":  at a particular time and from
          time to time the revolving credit loans made by Lender or
          Lenders to the Borrower under Section 2.1 of the Credit
          Agreement.

          "Revolving Credit Notes":  shall mean the promissory notes
          of the Borrower evidencing the revolving credit loan or
          loans made under the Credit Agreement, from time to time,
          appropriately completed, as amended, modified, extended,
          renewed, supplemented or replaced from time to time, payable
          to the order of such Lender and further evidencing the
          obligation of the Borrower to pay with interest the
          aggregate loans outstanding under the Credit Agreement to
          such Lender from time to time.

































     
<PAGE>

<PAGE>
     

          "Security Documents":  shall mean, as the same may be
          amended, waived, modified, extended, renewed, supplemented
          or replaced from time to time, that certain Pledge and
          Security Agreement of even date herewith executed and
          delivered by the Borrower in favor of Collateral Agent, that
          certain Security Agreement of even date herewith executed
          and delivered by the Borrower in favor of the Collateral
          Agent, that certain Security Agreement of even date herewith
          executed and delivered by the Restricted Subsidiaries and
          Guarantor, et al in favor of Collateral Agent, that certain
          Pledge and Security Agreement of even date herewith executed
          and delivered by the Guarantor in favor of the Collateral
          Agent, that certain Deed of Trust and Security Agreement of
          even date herewith executed and delivered by Borrower in
          favor of certain trustees for the benefit of the Collateral
          Agent, that certain Assignment of Leases and Rents of even
          date herewith executed and delivered by the Borrower in
          favor of the Collateral Agent, that certain Collateral
          Assignment of Trademarks of even date herewith executed and
          delivered by Borrower in favor of the Collateral Agent, that
          certain Collateral Assignment of Patents of even date
          herewith executed and delivered by Borrower in favor of the
          Collateral Agent, that certain Collateral Assignment of
          Trademarks of even date herewith executed and delivered by
          Symtron Systems, Inc. in favor of the Collateral Agent, that
          certain Collateral Assignment of 

          Patents of even date herewith executed and delivered by
          Symtron Systems, Inc. in favor of the Collateral Agent, that
          certain Collateral Assignment of Trademarks of even date
          herewith executed and delivered by AAI/ACL Technologies,
          Inc. in favor of the Collateral Agent, that certain
          Collateral Assignment of Patents of even date herewith
          executed and delivered by AAI/ACL Technologies, Inc. in
          favor of the Collateral Agent, and that certain Collateral
          Assignment of Copyrights of even date herewith executed and
          delivered by AAI/ACL Technologies, Inc. in favor of the
          Collateral Agent.

          "Subsidiary":  of a Person means (i) any corporation or
          other entity of which securities or other ownership
          interests having ordinary voting power to elect a majority
          of the board of directors or other persons performing
          similar functions are at the time, directly or indirectly,
          owned by such Person, or (ii) the





























     
<PAGE>

<PAGE>
     

          management of which is otherwise controlled, directly or
          indirectly, through one or more intermediaries, by such Person.

          "Symtron":  shall mean Symtron Systems, Inc., a New Jersey
          corporation."
        
          Section 2.     Section 5. (e) Restriction on Liens.
                         -----------------------------------
     Subsections (6), (7) and (8) be and hereby are added to Section 5. (e)
     of the Guaranty Agreement, as amended, as follows:
      
               "(6)  Liens in favor of the Collateral Agent
               created pursuant to the Security Documents
               securing the obligations under the Credit
               Agreement and the Revolving Credit Notes and under
               the Note Purchase Agreement and the Notes.

               (7)  Liens in favor of or for the benefit of the
               Issuing Bank in or upon cash, cash equivalents or
               other liquid assets pledged to the Issuing Bank in
               connection with, or in or upon bills of lading or
               other shipping or transportation documents,
               warehouse receipts or similar rights arising in
               connection with, the L/C Agreements or the
               issuance and payment of drawings under Letters of
               Credit.

               (8)  Liens in favor of or for the benefit of the
               Agent or any Lender in or upon cash, cash
               equivalents, marketable securities or other liquid
               assets and other rights relating to or in
               connection with overnight investments or other
               investments made or managed by Agent or any Lender
               for or on behalf of the Borrower, any of its
               Subsidiaries or Symtron."

          Section 3.     Section 7. Definitions.  Section 7 of the Guaranty
                         ----------------------
     Agreement is amended in its entirety as follows:

          ""Subsidiaries" of Guarantor means AAI Corporation, a
          Maryland corporation; Detroit Stoker Company, a Michigan
          corporation; Neo Products Co., an Illinois corporation;
          U.I.C.-Del. Corporation, a Delaware corporation; and Symtron
          Systems, Inc., a New Jersey corporation."





























     
<PAGE>

<PAGE>
     

          Section 4.     No Other Amendment. Except as specifically amended
                         ------------------
     herein, the Guaranty Agreement shall remain in full force and effect
     in accordance with its terms.

          Section 5.     Governing Law. This Amendment No. 2 shall be
                         -------------
     governed by and construed in accordance with the laws of the State of
     New York.

          Section 6.     Counterparts.  This Amendment No. 2 may be
                         ------------
     executed in any number of counterparts and by different parties hereto
     in separate counterparts, each of which when so executed shall be
     deemed to be an original and all of which taken together shall
     constitute one and the same agreement.

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment
     No. 2 to be executed by their respective officers thereunto duly
     authorized as of the date above first written.

                              UNITED INDUSTRIAL CORPORATION            




                              By:                           
                                 ---------------------------
                              Name: Howard Bloch            
                                   -------------------------
                              Title: Vice President         
                                    ------------------------




                              PRINCIPAL MUTUAL LIFE INSURANCE COMPANY


                              By:                            
                                 ----------------------------
                              Name:                          
                                   --------------------------
                              Title:                         
                                    -------------------------



                              By:                            
                                 ----------------------------
                              Name:                          
                                   --------------------------

                              Title:                         
                                    -------------------------


















     
<PAGE>

<PAGE>
     

                              THE TRAVELERS INSURANCE COMPANY




                              By:                            
                                 ----------------------------
                              Name:                          
                                   --------------------------
                              Title:                         
                                    -------------------------


































































<PAGE>





     EXHIBIT 11 -  Computation of Earnings Per Share - 



<TABLE>
     Item 6(a)
     Exhibit 11
     Computation of Earnings per Share
     United Industrial Corporation and Subsidiaries



<CAPTION>


                                           Three Months Ended        Nine Months Ended
                                                September 30         September 30   
                                          -------------------        ---------------
                                           1994         1993         1994           1993 
                                           ----         ----         ----           ----
      <S>                            <C>          <C>          <C>          <C>
      Primary:

          Average shares outstanding  12,253,244   12,258,693   12,256,876     12,258,693
                                      ==========   ==========   ==========     ==========
          Net income (loss)           $1,538,000   $1,828,000   $4,000,000   $(12,904,000)
                                      ==========   ==========   ==========   ============

          Earnings (loss) per share       $  .13       $  .15       $  .33         $(1.05)
                                          ======       ======       ======         ======

  </TABLE>



             
<PAGE>

<TABLE> <S> <C>



 <ARTICLE> 5
 <LEGEND>
 This Schedule contains summary financial
 information extracted from the financial
 statements contained in the body of the
 accompanying Form 10-Q and is qualified in
 its entirety by reference to such financial
 statements.
 </LEGEND>
 <MULTIPLIER>                  1,000
        
 <S>                           <C>
 <PERIOD-TYPE>                 9-mos
 <FISCAL-YEAR-END>             Dec-31-1993
 <PERIOD-END>                  Sep-30-1994
 <CASH>                        14,035
 <SECURITIES>                  0
 <RECEIVABLES>                 36,416
 <ALLOWANCES>                  0
 <INVENTORY>                   51,918
 <CURRENT-ASSETS>              111,161
 <PP&E>                        125,723
 <DEPRECIATION>                80,115
 <TOTAL-ASSETS>                199,549
 <CURRENT-LIABILITIES>         44,450
 <BONDS>                       30,300
          0
                    0
 <COMMON>                      14,374
 <OTHER-SE>                    73,109
 <TOTAL-LIABILITY-AND-EQUITY>  199,549

 <SALES>                       152,002
 <TOTAL-REVENUES>              152,002
 <CGS>                         115,418
 <TOTAL-COSTS>                 146,368
 <OTHER-EXPENSES>              (204)
 <LOSS-PROVISION>              0
 <INTEREST-EXPENSE>            2,210
 <INCOME-PRETAX>               6,491
 <INCOME-TAX>                  2,491
 <INCOME-CONTINUING>           4,000
 <DISCONTINUED>                0
 <EXTRAORDINARY>               0
 <CHANGES>                     0
 <NET-INCOME>                  4,000
 <EPS-PRIMARY>                 .33
 <EPS-DILUTED>                 .33
         





</TABLE>


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